Sagot :
E = (3 + 4x)(4x - 3)
E=3*4x+3*(-3)+4x*4x+4x*(-3)
E=12x-9+16x²-12x
E=16x²-9
E=(4x)²-(-3)²
F=(7 - 4x)(4x + 7)
F=7*4x+7*7-4x*4x-4x*7
F=28x+49-16x²-28x
F=-16x²+49
G = (x + 2)2 - (3x - 5)^2
G = x²+4x+4-(25-30x+9x²)
G =x²+4x+4-25+30x-9x²
G = -8x²+34x-21