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11.2: Arithmetic 11.2: Arithmetic Sequences & Series Sequences & Series

# 11.2: Arithmetic Sequences & Series

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11.2: Arithmetic Sequences & Series. n th Term of an Arithmetic Sequence: a n = a 1 + ( n – 1) d Ex. 1 Determine the following using the table below. n th Term of an Arithmetic Sequence: a n = a 1 + ( n – 1) d Ex. 1 Determine the following using the table below. - PowerPoint PPT Presentation

### Text of 11.2: Arithmetic Sequences & Series 11.2: Arithmetic Sequences & 11.2: Arithmetic Sequences & SeriesSeries nnthth Term of an Arithmetic Term of an Arithmetic Sequence:Sequence:

aann = = aa11 + ( + (nn – 1) – 1)dd

Ex. 1Ex. 1Determine the following using the Determine the following using the table below.table below.

5555 4949 4343 3737

aa11 aa22 aa33 aa44 nnthth Term of an Arithmetic Term of an Arithmetic Sequence:Sequence:

aann = = aa11 + ( + (nn – 1) – 1)dd

Ex. 1Ex. 1Determine the following using the Determine the following using the table below.table below.

a) Find the 10a) Find the 10thth term in the sequence. term in the sequence.

5555 4949 4343 3737

aa11 aa22 aa33 aa44 nnthth Term of an Arithmetic Term of an Arithmetic Sequence:Sequence:

aann = = aa11 + ( + (nn – 1) – 1)dd

Ex. 1Ex. 1Determine the following using the Determine the following using the table below.table below.

a) Find the 10a) Find the 10thth term in the sequence. term in the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd

5555 4949 4343 3737

aa11 aa22 aa33 aa44 nnthth Term of an Arithmetic Term of an Arithmetic Sequence:Sequence:

aann = = aa11 + ( + (nn – 1) – 1)dd

Ex. 1Ex. 1Determine the following using the Determine the following using the table below.table below.

a) Find the a) Find the 1010thth term in the sequence. term in the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd

aa1010 = = aa11 + ( + (1010 – 1) – 1)dd

5555 4949 4343 3737

aa11 aa22 aa33 aa44 nnthth Term of an Arithmetic Term of an Arithmetic Sequence:Sequence:

aann = = aa11 + ( + (nn – 1) – 1)dd

Ex. 1Ex. 1Determine the following using the Determine the following using the table below.table below.

a) Find the 10a) Find the 10thth term in the sequence. term in the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd

aa1010 = = 5555 + (10 – 1) + (10 – 1)dd

5555 4949 4343 3737

aa11 aa22 aa33 aa44 nnthth Term of an Arithmetic Term of an Arithmetic Sequence:Sequence:

aann = = aa11 + ( + (nn – 1) – 1)dd

Ex. 1Ex. 1Determine the following using the Determine the following using the table below.table below.

a) Find the 10a) Find the 10thth term in the sequence. term in the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd

aa1010 = 55 + (10 – 1) = 55 + (10 – 1)(-6)(-6)

5555 4949 4343 3737

aa11 aa22 aa33 aa44 nnthth Term of an Arithmetic Term of an Arithmetic Sequence:Sequence:

aann = = aa11 + ( + (nn – 1) – 1)dd

Ex. 1Ex. 1Determine the following using the Determine the following using the table below.table below.

a) Find the 10a) Find the 10thth term in the sequence. term in the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd

aa1010 = 55 + (10 – 1)(-6) = 55 + (10 – 1)(-6)

5555 4949 4343 3737

aa11 aa22 aa33 aa44 nnthth Term of an Arithmetic Sequence: Term of an Arithmetic Sequence:

aann = = aa11 + ( + (nn – 1) – 1)dd

Ex. 1Ex. 1Determine the following using the Determine the following using the table below.table below.

a) Find the 10a) Find the 10thth term in the sequence. term in the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd

aa1010 = 55 + ( = 55 + (10 – 110 – 1)(-6))(-6)

aa1010 = 55 + ( = 55 + (99)(-6))(-6)

5555 4949 4343 3737

aa11 aa22 aa33 aa44 nnthth Term of an Arithmetic Sequence: Term of an Arithmetic Sequence:

aann = = aa11 + ( + (nn – 1) – 1)dd

Ex. 1Ex. 1Determine the following using the Determine the following using the table below.table below.

a) Find the 10a) Find the 10thth term in the sequence. term in the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd

aa1010 = 55 + (10 – 1)(-6) = 55 + (10 – 1)(-6)

aa1010 = 55 + = 55 + (9)(-6)(9)(-6)

aa1010 = 55 = 55 – 54 – 54

5555 4949 4343 3737

aa11 aa22 aa33 aa44 nnthth Term of an Arithmetic Sequence: Term of an Arithmetic Sequence:

aann = = aa11 + ( + (nn – 1) – 1)dd

Ex. 1Ex. 1Determine the following using the Determine the following using the table table below.below.

a) Find the 10a) Find the 10thth term in the sequence. term in the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd

aa1010 = 55 + (10 – 1)(-6) = 55 + (10 – 1)(-6)

aa1010 = 55 + (9)(-6) = 55 + (9)(-6)

aa1010 = 55 – 54 = 55 – 54

aa1010 = 1 = 1

5555 4949 4343 3737

aa11 aa22 aa33 aa44 b) Write an equation for the b) Write an equation for the nnthth term term of of the sequence.the sequence. b) Write an equation for the b) Write an equation for the nnthth term term of of the sequence.the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd b) Write an equation for the b) Write an equation for the nnthth term term of of the sequence.the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd

aann = = 5555 + ( + (nn – 1) – 1)(-6)(-6) b) Write an equation for the b) Write an equation for the nnthth term term of of the sequence.the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd

aann = 55 + ( = 55 + (nn – 1) – 1)(-6)(-6)

aann = 55 = 55 - 6- 6((nn – 1) – 1) b) Write an equation for the b) Write an equation for the nnthth term term of of the sequence.the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd

aann = 55 + ( = 55 + (nn – 1)(-6) – 1)(-6)

aann = 55 = 55 - 6(- 6(nn – 1) – 1) aann = 55 = 55 - 6- 6nn + 6 + 6 b) Write an equation for the b) Write an equation for the nnthth term term of of the sequence.the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd

aann = 55 + ( = 55 + (nn – 1)(-6) – 1)(-6)

aann = 55 - 6( = 55 - 6(nn – 1) – 1) aann = = 5555 - 6 - 6nn + 6 + 6

aann = - 6 = - 6nn + 61 + 61 b) Write an equation for the b) Write an equation for the nnthth term term of of the sequence.the sequence.

aann = = aa11 + ( + (nn – 1) – 1)dd

aann = 55 + ( = 55 + (nn – 1)(-6) – 1)(-6)

aann = 55 - 6( = 55 - 6(nn – 1) – 1) aann = 55 - 6 = 55 - 6nn + 6 + 6

aann = - 6 = - 6nn + 61 + 61 Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

24, ___, ___, ___, ___, -124, ___, ___, ___, ___, -1 Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

24, ___, ___, ___, ___, -124, ___, ___, ___, ___, -1

***Find the missing terms in the sequence!***Find the missing terms in the sequence! Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

24, ___, ___, ___, ___, -124, ___, ___, ___, ___, -1

aa11 aa22 aa33 aa44 aa55 aa66 Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

2424, ___, ___, ___, ___, , ___, ___, ___, ___, -1-1

aa11 aa22 aa33 aa44 aa55 aa66 Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

2424, ___, ___, ___, ___, , ___, ___, ___, ___, -1-1

aa11 aa22 aa33 aa44 aa55 aa66

nn = 6 = 6

aa11 = 24 = 24

aa66 = -1 = -1 Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

2424, ___, ___, ___, ___, , ___, ___, ___, ___, -1-1

aa11 aa22 aa33 aa44 aa55 aa66

nn = 6 = 6

aa11 = 24 = 24

aa66 = -1 = -1

aann = = aa11 + ( + (nn – 1) – 1)dd Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

2424, ___, ___, ___, ___, , ___, ___, ___, ___, -1-1

aa11 aa22 aa33 aa44 aa55 aa66

nn = 6 = 6

aa11 = 24 = 24

aa66 = -1 = -1

aann = = aa11 + ( + (nn – 1) – 1)dd

-1-1 = = 2424 + (+ (66 – 1) – 1)dd Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

2424, ___, ___, ___, ___, , ___, ___, ___, ___, -1-1

aa11 aa22 aa33 aa44 aa55 aa66

nn = 6 = 6 aa11 = 24 = 24 aa66 = -1 = -1

aann = = aa11 + ( + (nn – 1) – 1)dd

-1-1 = = 2424 + (+ (66 – 1) – 1)dd

-1 = 24 + 5-1 = 24 + 5dd

-25 = 5-25 = 5dd

-5 = -5 = dd Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

2424, ___, ___, ___, ___, , ___, ___, ___, ___, -1-1

aa11 aa22 aa33 aa44 aa55 aa66

nn = 6 = 6 aa11 = 24 = 24 aa66 = -1 = -1

aann = = aa11 + ( + (nn – 1) – 1)dd

-1-1 = = 2424 + (+ (66 – 1) – 1)dd

-5 = -5 = dd

aa11 = 24 = 24 Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

2424, ___, ___, ___, ___, , ___, ___, ___, ___, -1-1

aa11 aa22 aa33 aa44 aa55 aa66

nn = 6 = 6 aa11 = 24 = 24 aa66 = -1 = -1

aann = = aa11 + ( + (nn – 1) – 1)dd

-1-1 = = 2424 + (+ (66 – 1) – 1)dd

-5 = -5 = dd

aa11 = 24 = 24

aa22 = 24 + (-5) = 19 = 24 + (-5) = 19 Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

2424, ___, ___, ___, ___, , ___, ___, ___, ___, -1-1

aa11 aa22 aa33 aa44 aa55 aa66

nn = 6 = 6 aa11 = 24 = 24 aa66 = -1 = -1

aann = = aa11 + ( + (nn – 1) – 1)dd

-1-1 = = 2424 + (+ (66 – 1) – 1)dd

-5 = -5 = dd

aa11 = 24 = 24

aa22 = 24 + (-5) = 19 = 24 + (-5) = 19

aa33 = 19 + (-5) = 14 = 19 + (-5) = 14 Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

2424, ___, ___, ___, ___, , ___, ___, ___, ___, -1-1

aa11 aa22 aa33 aa44 aa55 aa66

nn = 6 = 6 aa11 = 24 = 24 aa66 = -1 = -1 dd = -5 = -5

aa11 = 24 = 24

aa22 = 24 + (-5) = 19 = 24 + (-5) = 19

aa33 = 19 + (-5) = 14 = 19 + (-5) = 14

aa44 = 14 + (-5) = 9 = 14 + (-5) = 9 Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

2424, ___, ___, ___, ___, , ___, ___, ___, ___, -1-1

aa11 aa22 aa33 aa44 aa55 aa66

nn = 6 = 6 aa11 = 24 = 24 aa66 = -1 = -1 dd = -5 = -5

aa11 = 24 = 24

aa22 = 24 + (-5) = 19 = 24 + (-5) = 19

aa33 = 19 + (-5) = 14 = 19 + (-5) = 14

aa44 = 14 + (-5) = 9 = 14 + (-5) = 9

aa55 = 9 + (-5) = 4 = 9 + (-5) = 4 Ex. 2Ex. 2 Find the arithmetic means in the Find the arithmetic means in the sequence below.sequence below.

2424, ___, ___, ___, ___, , ___, ___, ___, ___, -1-1

aa11 aa22 aa33 aa44 aa55 aa66

nn = 6 = 6 aa11 = 24 = 24 aa66 = -1 = -1 dd = -5 = -5

aa11 = 24 = 24

aa22 = 24 + (-5) = = 24 + (-5) = 1919

aa33 = 19 + (-5) = = 19 + (-5) = 1414

aa44 = 14 + (-5) = = 14 + (-5) = 99

aa55 = 9 + (-5) = = 9 + (-5) = 44 Sum of an Arithmetic SeriesSum of an Arithmetic Series Sum of an Arithmetic SeriesSum of an Arithmetic Series

The sum The sum SSnn of the first of the first nn terms of an terms of an

arithmetic series is given by the following:arithmetic series is given by the following: Sum of an Arithmetic SeriesSum of an Arithmetic Series

The sum The sum SSnn of the first of the first nn terms of an terms of an

arithmetic series is given by the following:arithmetic series is given by the following:

SSnn = ½ = ½nn[ 2[ 2aa11 + ( + (nn – 1) – 1)d d ]] Sum of an Arithmetic SeriesSum of an Arithmetic Series

The sum The sum SSnn of the first of the first nn terms of an terms of an

arithmetic series is given by the following:arithmetic series is given by the following:

SSnn = ½ = ½nn[ 2[ 2aa11 + ( + (nn – 1) – 1)d d ]]

OROR SSnn = ½ = ½nn[ [ aa11 + + aann ] ] Sum of an Arithmetic SeriesSum of an Arithmetic Series

The sum The sum SSnn of the first of the first nn terms of an terms of an

arithmetic series is given by the following:arithmetic series is given by the following:

SSnn = ½ = ½nn[ 2[ 2aa11 + + ((nn – 1) – 1)dd ]]

OROR SSnn = ½ = ½nn[ [ aa11 + + aann ] ] Sum of an Arithmetic SeriesSum of an Arithmetic Series

The sum The sum SSnn of the first of the first nn terms of an terms of an

arithmetic series is given by the following:arithmetic series is given by the following:

SSnn = ½ = ½nn[ [ 22aa11 + ( + (nn – 1) – 1)d d ]]

OROR SSnn = ½ = ½nn[ [ aa11 + + aann ] ] Sum of an Arithmetic SeriesSum of an Arithmetic Series

The sum The sum SSnn of the first of the first nn terms of an terms of an

arithmetic series is given by the following:arithmetic series is given by the following:

SSnn = ½ = ½nn[ 2[ 2aa11 + ( + (nn – 1) – 1)d d ]]

OROR SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

Ex. 3Ex. 3 Find Find SSnn for each of the following:for each of the following: Sum of an Arithmetic SeriesSum of an Arithmetic Series

The sum The sum SSnn of the first of the first nn terms of an terms of an

arithmetic series is given by the following:arithmetic series is given by the following:

SSnn = ½ = ½nn[ 2[ 2aa11 + ( + (nn – 1) – 1)d d ]]

OROR SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

Ex. 3Ex. 3 Find Find SSnn for each of the following:for each of the following:

a) a) aa11 = 58, = 58, aann = -7, = -7, nn = 26 = 26 Sum of an Arithmetic SeriesSum of an Arithmetic Series

The sum The sum SSnn of the first of the first nn terms of an terms of an

arithmetic series is given by the following:arithmetic series is given by the following:

SSnn = ½ = ½nn[ 2[ 2aa11 + ( + (nn – 1) – 1)d d ]]

OROR SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

Ex. 3Ex. 3 Find Find SSnn for each of the following:for each of the following:

a) a) aa11 = 58, = 58, aann = -7, = -7, nn = 26 = 26 Sum of an Arithmetic SeriesSum of an Arithmetic Series

The sum The sum SSnn of the first of the first nn terms of an terms of an

arithmetic series is given by the following:arithmetic series is given by the following:

SSnn = ½ = ½nn[ 2[ 2aa11 + ( + (nn – 1) – 1)d d ]]

OROR SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

Ex. 3Ex. 3 Find Find SSnn for each of the following:for each of the following:

a) a) aa11 = 58, = 58, aann = -7, = -7, nn = 26 = 26

SSnn = ½ = ½nn[ [ aa11 + + aann ] ] Sum of an Arithmetic SeriesSum of an Arithmetic Series

The sum The sum SSnn of the first of the first nn terms of an terms of an

arithmetic series is given by the following:arithmetic series is given by the following:

SSnn = ½ = ½nn[ 2[ 2aa11 + ( + (nn – 1) – 1)d d ]]

OROR SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

Ex. 3Ex. 3 Find Find SSnn for each of the following:for each of the following:

a) a) aa11 = 58= 58, , aann = -7 = -7, , nn = 26 = 26

SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

SSnn = ½( = ½(2626)[ )[ 5858 - 7- 7 ] ] Sum of an Arithmetic SeriesSum of an Arithmetic Series

The sum The sum SSnn of the first of the first nn terms of an terms of an

arithmetic series is given by the following:arithmetic series is given by the following:

SSnn = ½ = ½nn[ 2[ 2aa11 + ( + (nn – 1) – 1)d d ]]

OROR SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

Ex. 3Ex. 3 Find Find SSnn for each of the following:for each of the following:

a) a) aa11 = 58, = 58, aann = -7, = -7, nn = 26 = 26

SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

SSnn = ½(26)[ = ½(26)[ 58 - 758 - 7 ] ]

SSnn = ½(26)[ = ½(26)[ 5151 ] ] Sum of an Arithmetic SeriesSum of an Arithmetic Series

The sum The sum SSnn of the first of the first nn terms of an terms of an arithmetic series is given by the following:arithmetic series is given by the following:

SSnn = ½ = ½nn[ 2[ 2aa11 + ( + (nn – 1) – 1)d d ]]

OROR SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

Ex. 3Ex. 3 Find Find SSnn for each of the following:for each of the following:

a) a) aa11 = 58, = 58, aann = -7, = -7, nn = 26 = 26

SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

SSnn = ½(26)[ 58 - 7 ] = ½(26)[ 58 - 7 ]

SSnn = = ½(26)½(26)[ 51 ][ 51 ]

SSnn = = 1313[ 51 ][ 51 ] Sum of an Arithmetic SeriesSum of an Arithmetic Series

The sum The sum SSnn of the first of the first nn terms of an terms of an arithmetic series is given by the following:arithmetic series is given by the following:

SSnn = ½ = ½nn[ 2[ 2aa11 + ( + (nn – 1) – 1)d d ]]

OROR SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

Ex. 3Ex. 3 Find Find SSnn for each of the following:for each of the following:

a) a) aa11 = 58, = 58, aann = -7, = -7, nn = 26 = 26

SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

SSnn = ½(26)[ 58 - 7 ] = ½(26)[ 58 - 7 ]

SSnn = ½(26)[ 51 ] = ½(26)[ 51 ]

SSnn = = 13(51)13(51) = = 663663 Ex. 4Ex. 4 1616

∑ ∑ (4(4kk – 2) – 2) kk = 1 = 1 Ex. 4Ex. 4 1616

∑ ∑ (4(4kk – 2) – 2) kk = 1 = 1

nn = 16 = 16 Ex. 4Ex. 4 1616

∑ ∑ (4(4kk – 2) – 2) kk = 1 = 1

nn = 16 = 16

aa11 = 4(1) – 2 = 2= 4(1) – 2 = 2 Ex. 4Ex. 4 1616

∑ ∑ (4(4kk – 2) – 2) kk = 1 = 1

nn = 16 = 16

aa11 = 4(1) – 2 = 2= 4(1) – 2 = 2

aann = 4(16) – 2 = 62 = 4(16) – 2 = 62 Ex. 4Ex. 4 1616

∑ ∑ (4(4kk – 2) – 2) kk = 1 = 1

nn = 16 = 16

aa11 = 4(1) – 2 = 2= 4(1) – 2 = 2

aann = 4(16) – 2 = 62 = 4(16) – 2 = 62

SSnn = ½ = ½nn[ [ aa11 + + aann ] ] Ex. 4Ex. 4 1616

∑ ∑ (4(4kk – 2) – 2) kk = 1 = 1

nn = 16 = 16

aa11 = 4(1) – 2 = 2= 4(1) – 2 = 2

aann = 4(16) – 2 = 62 = 4(16) – 2 = 62

SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

SSnn = ½( = ½(1616)[)[22 + + 6262]] Ex. 4Ex. 4 1616

∑ ∑ (4(4kk – 2) – 2) kk = 1 = 1

nn = 16 = 16

aa11 = 4(1) – 2 = 2= 4(1) – 2 = 2

aann = 4(16) – 2 = 62 = 4(16) – 2 = 62

SSnn = ½ = ½nn[ [ aa11 + + aann ] ]

SSnn = ½( = ½(1616)[)[22 + + 6262]]

SSnn = 512 = 512 ##### 4.6 Arithmetic Sequences - Weeblyederushe.weebly.com/uploads/3/7/6/5/37655305/alg._1_4.6_tb.pdfSection 4.6 Arithmetic Sequences 209 4.6 Arithmetic Sequences COMMON ... Equation for
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