Sagot :
Réponse :
E = (2x+3)(5x-8) - (2x-4)(5x-1) = 10x² - 16x + 15x - 24 = 10x² - x - 24
F = (5x-2)(5x-8) - (3x-5)(x+7) = 25x² - 40x - 10x + 16 = 25x² - 50x + 16
G = 2(x+7)(3-2x) + (5x-2)(4x+1) =6x - 4x² + 42 - 28x = - 4x² - 22x + 42
H = (x+5)² = (x+5)(x+5) = x² + 5x + 5x + 25 = x² + 10x + 25
I = (4x+6)² = (4x+6)(4x+6) = 16x² + 24x + 24x + 36 = 16x² + 48x + 36
J = (x-5)² = (x-5)(x-5) = x² - 5x - 5x + 25 = x² - 10x + 25
K = (3x-7)² = (3x-7)(3x-7) = 9x² - 21x - 21x + 49 = 9x² - 42x + 49
L = (y+3)(y-3) = y² - 3y + 3y - 9 = y² - 9
M = (2x+5)(2x-5) = 4x² - 10x + 10x - 25 = 4x² - 25
Explications étape par étape :