Lista 9º ano resolvida

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  • Professora Andria Santana

    1) x - 5x + 6 = 0 a=1 b= 5 c=6 = = (-5) - 4.1.6 = 25 - 24 = 1

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    2) x - 8x + 12 = 0 a=1 b= 8 c=12 = = (-8) - 4.1.12 = 64 48 = 16

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  • Professora Andria Santana

    3) x + 2x - 8 = 0 a=1 b= 2 c=-8 = = 2 - 4.1.(-8) = 4+32 = 36

    4) x - 5x + 8 = 0

    a=1 b= 5 c=8 = ( )

    No possui razes reais

  • Professora Andria Santana

    5) 2x - 8x + 8 = 0 a=2 b= 8 c=8 = = (-8) - 4.2.8 = 64-64 = 0

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    6) x - 4x - 5 = 0 a=1 b= 4 c= 5 = = (-4) - 4.1.(-5) = 16 + 20 = 36

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  • Professora Andria Santana

    7) - x + x + 12 = 0 a= 1 b= 1 c=12 = = 1 - 4.(-1).12 = 1+48 = 49

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    8) -x + 6x - 5 = 0 a= 1 b= 6 c= 5 = = ( ) ( ) = 36 20 = 16

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  • Professora Andria Santana

    9) 6x + x - 1 = 0 a= 6 b= 1 c= 1 = = ( ) = 1+24 = 25

    10) 3x - 7x + 2 = 0 a= 6 b= 1 c= 1 = = ( ) = 1+24 = 25

  • Professora Andria Santana

    11) 2x - 7x = 15 2x 7x 15 = 0 a=2 b= -7 c= -15 = = (-7) - 4.2.(-15) = 49 + 120 = 169

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    12) 4x + 9 = 12x 4x - 12x + 9 = 0 a=4 b= -12 c= 9 = = (-12) - 4.4.9 = 144 - 144 = 0

  • Professora Andria Santana

    13) x = x + 12 x - x 12 = 0 a=1 b= 2 c=-8 = = 2 - 4.1.(-8) = 4+32 = 36

    14) 2x = -12x - 18 2x +12x + 18 = 0

    a=2 b= 12 c=18 = = 12 - 4.2.18 = 144 - 144 = 0

  • Professora Andria Santana

    15) ( x - 5) = 1

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    a=1 b= -10 c= 24 = = (-10) - 4.1.24 = 100 - 96 = 4

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  • Professora Andria Santana

    16) 25x = 20x 4 a=25 b= -20 c= 4 = = (-20) - 4.25.4 = 400 400 = 0

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    17) 2x = 15 x a=1 b= 2 c= -15 = = 2 - 4.1.(-15) = 4+60 = 64

  • Professora Andria Santana

    18) x + 3x 6 = -8 a=1 b= 3 c= 2 = = 3 - 4.1.2 = 9-8 = 1

    19) x + x 7 = 5 a=1 b= 1 c= -12 = = 1 - 4.1.(-12) = 1+48 = 49

  • Professora Andria Santana

    20) 4x - x + 1 = x + 3x

    a=1 b= -2 c= 1 = = (-2) - 4.1.1 = 4 - 4 = 0

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    21) 3x + 5x = -x 9 + 2x

    a=1 b= 6 c= 9 = = 6 - 4.1.9 = 36-36 = 0

  • Professora Andria Santana

    22) 4 + x ( x - 4) = x

    a=1 b= -5 c= 4 = = (-5) - 4.1.4 = 25 - 16 = 9

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    23) x ( x + 3) 40 = 0 a=1 b= 3 c= -40 = = 3 - 4.1.(-40) = 9+160 = 169

  • Professora Andria Santana

    24) x + 5x + 6 = 0

    a=1 b= 5 c= 6 = = 5 - 4.1.6 = 25-24 = 1

    25) x - 7x + 12 = 0

    a=1 b= -7 c= 12 = = (-7) - 4.1.12 = 49-48 = 1

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  • Professora Andria Santana

    26) x + 5x + 4 = 0

    a=1 b= 5 c= 4 = = 5 - 4.1.4 = 25-16 = 9

    27) ( 2x - 4) = 0

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    a=4 b= -16 c= 16 = = (-16) - 4.4.16 = 256-256 = 0

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  • Professora Andria Santana

    28) x - 18x + 45 = 0 _____(R:3,15)

    a=1 b= -18 c= 45 = = (-18) - 4.1.45 = 324 - 180 = 144

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    29) -x - x + 30 = 0

    a=-1 b= -1 c= 30 = = (-1) - 4.(-1).30 = 1 + 120 = 121

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  • Professora Andria Santana

    30) x - 6x + 9 = 0

    a=1 b= -6 c= 9 = = (-6) - 4.1.9 = 36-36 = 0

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    31) ( x + 3) = 1 ( )( )

    a=1 b= 6 c= 8 = = 6 - 4.1.8 = 36-32 = 4

  • Professora Andria Santana

    32) x + 3x - 28 = 0 (R: -7,4)

    a=1 b= 3 c= -28 = = 3 - 4.1.(-28) = 9+112 = 121

    33) x - 3 = 4x + 2 (R: -1,5) a=1 b= -4 c= -5 = = (-4) - 4.1.(-5) = 16+20 = 36

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