Bonjour,
(4x-2)(5x+8)+(-2x-1)(5x+8) = (5x+8)[(4x-2)+(-2x-1)]
= (5x+8)(4x-2x-2-1)
= (5x+8)(2x-3)
(-2x-2)²+(-2x-2)(5x+6) = (-2x-2)(-2x-2)+(-2x-2)(5x+6)
= (-2x-2)[(-2x-2)+(5x+6)]
= (-2x-2)(-2x+5x-2+6)
= (-2x-2)(3x+4)
= -(2x+2)(3x+4)
il manque un signe dans (4-2x)(-9x+1)(-9x+1)(-3x+4)
4x²+32x+64 = (2x)²+2(2x)(8) + 8² = (2x+8)²
