Réponse :
Explications étape par étape
Bonsoir,
Recopier et développer :
A = 4x² + 2x - 3 - 6x - 9 + x²
A = 5x² - 4x - 12
B = (-5x - 9) - (7x + 2)
B = -5x - 9 - 7x - 2
B = -12x - 11
C = -4(2x - 3)
C = -4 * 2x - 4 * (-3)
C = -8x + 12
D = (x + 2)(4x + 6)
D = x * 4x + x * 6 + 2 * 4x + 2 * 6
D = 4x² + 6x + 8x + 12
D = 4x² + 14x + 12
E = (3x - 2)(2x + 4)
E = 3x * 2x + 3x * 4 - 2 * 2x - 2 * 4
E = 6x² + 12x - 4x - 8
E = 6x² + 8x - 8
F = (x + 3)²
F = x² + 2 * 3 * x + 3²
F = x² + 6x + 9
G = (2x - 4)²
G = (2x)² - 2 * 2x * 4 + 4²
G = 4x² - 16x + 16
H = (5x - 9)(5x + 9)
H = (5x)² - 9²
H = 25x² - 81
