Sagot :
bonsoir
A = - 5 (x + 8) = - 5 x - 40
B = 2*3x - 5*4x = 6 x - 20 x = - 14 x
C = (4x + 3)² = 16 x² + 24 x + 9
D = (2x + 7)(5x - 9) = 10 x² - 18 x + 35 x - 63 = 10 x² + 17 x - 63
C = 4x(x-8) – 5(x + 3) = 4 x² - 32 x - 5 x - 15 = 4 x² - 37 x - 15
D = (6x - 9)(6x + 9) = 36 x² - 81
Réponse :
développer et réduire
A = - 5 (x + 8) = - 5 x - 40
B = 2 * 3 x - 5 * 4 x
= 6 x - 20 x
= - 14 x
C = (4x + 3)² = 16 x² + 24 x + 9 IDR
D = (2x + 7)(5x - 9) = 10 x² - 18 x + 35 x - 63 = 10 x² + 27 x - 63
E = 4x(x-8) – 5(x + 3) = 4 x² - 32 x - 5 x - 15 = 4 x² - 37 x - 15
F = (6x - 9)(6x + 9) = 36 x² - 81 IDR
Explications étape par étape :