bonjour, pouvez vous m'aider à factoriser ces expression: G = 81x2 - 16 H = (x + 1)2 – 64 I = (2x – 1)2 – (4x + 9)2 J = 16x2 + 24x + 9 je suis en 3ème

bjr

G = 81x² - 16  = (9x)² - 4² = (9x+4) (9x-4)

H = (x + 1)² – 64  ) = (x+1)² - 8² = (x+1 +8) (x+1 - 8) = (x+9) (x-7)

I = (2x – 1)² – (4x + 9)² = (2x-1 + 4x+9) (2x-1 -(4x+9) = (6x+8) (-2x-10)

J = 16x2 + 24x + 9 = (4x)² + 2*4*3x + 3² = (4x+3)²

Bonjour,

G=81x²-16

  =(9x+4)(9x-4)

H=(x+1)²-64

  =x²+2x+1-64

  =x²+2x-63

  =(x-7)(x+9)

I=(2x-1)²-(4x+9)²

=4x²-4x+1-16x²-72x-81

=12x²-76x-80

=(-2x-10)(6x+8)

J=16x²+24x+9

 =(4x+3)²