Upload
lesley-mccarthy
View
221
Download
0
Embed Size (px)
Citation preview
Warmups – factor.
1) 2xy3 – 6x2y
2) x2 – 12x + 36
3) 4y2 + 36y + 81
4) 4ax – 6bx + 6ay – 9by
10-5 Perfect Square Trinomials
Objective: To identify and factor perfect square trinomials.
Standard 11.0
Remember…
So….
2( )a b 2 22a ab b
2 22a ab b 2( )a b
Recognizing a Perfect Square Trinomial
4x2 + 36xy + 81y2
1st term is a perfect square 3rd term is a perfect square (and positive) 2nd = 2•√1st •√3rd , can be positive or negative Then…
Example
x2 – 12x + 36
(x – 6)2
2(2 )x2(9 )y
2(2 )(9 )x y2(2 9 )x y
TOO: IS IT A PERFECT SQUARE TRINOMIAL?
1) x2 + 8x + 16
2) x2 + 6x – 9
3) x2 + 5x + 25
4) x2 + 10x + 25
5) 4x2 – 20x + 25
6) x2 + 8x + 12
7) 49 – 14y + y2
8) 2x2 + 8x + 16
9) x2 – 2x – 3
10) x2 – 2x + 1
1) YES
2) NO -9
3) NO x•2•5 ≠ 5x
4) YES
5) YES
6) NO √12
7) YES
8) NO 2(x2 + 4x + 8)
9) NO √-3
10) YES
FACTOR practice time.
2 8 16r r 2( 4)r 249 28 4p p 2(7 2)p
2 24 12 9y yz z 2(2 3 )y z2 24 4x xy y 2(2 )x y281 180 100n n 2(9 10)n
Completing the Square
2 6 __x x
Take half of the middle term and square it to get the third term!
9 2 ___ 144c
2 12c 24c
24c
TOO:
2 2 ___a a 216 56 ___s s
2 2____ 49a b 29 ____ 25k
TOO FOR HOMEWORKfactor the perfect square trinomials
1) x2 – 18x + 81
2) 9x2 + 24xy + 16y2
3) 100 + 20x + x2
4) 4x2 + 4x + 1
5) x2 – 14x + 49
Homework
Perfect Square Trinomials Worksheet