Répondre :
Bonsoir,
a) (3x+1)²+9x²-1 = 9x²+6x+1+9x²-1
= 18x² + 6x
= 6x(3x+1)
b) (2x-3)(3x+7)-2x+3 = 6x²+14x-9x-21-2x+3
= 6x²+3x-18
= 3(2x²+x+6)
c) (5x-4)²-5x+4 = 25x²-40x+16-5x+4
= 25x²-45x+20
= 5(5x²-9x+4)
a)(3x+1)²+9x²-1 b)(2x-3)(3x+7)-2x+3 c)(5x-4)²-5x+4 peut ont m'aidez a factorisez ssvp
Bonsoir,
a) (3x+1)²+9x²-1 = 9x²+6x+1+9x²-1
= 18x² + 6x
= 6x(3x+1)
b) (2x-3)(3x+7)-2x+3 = 6x²+14x-9x-21-2x+3
= 6x²+3x-18
= 3(2x²+x+6)
c) (5x-4)²-5x+4 = 25x²-40x+16-5x+4
= 25x²-45x+20
= 5(5x²-9x+4)