Sagot :
A = (4x-5)²
A = 16x² - 2*4x*5 + 25
A = 16x² - 40x + 25
B = (6x-3)(6x+3)
B = 36x² + 18x - 18x - 9
B = 36x² - 9
C = (x+7)²
C = x² + 14x + 49
D = (8x+2)²- (5x-10)(5x-10)
D = 64x² + 32x + 4 - 25x² + 50x - 50x - 100
D = 39x² + 32x - 96
voilà :)
A= (4x-5)²
A= 16X² -40x + 25
B=(6x-3)(6x+3)
B= 36X² - 9
C=(x+7)²
C= X² + 14X +49
D=(8x+2)²- (5x-10)(5x-10)
D= 64X² + 32X +4 - 25X² +100X -100
D=39X² +132X -96