Bonjour
♧ Développer et reduire les expressions :
A = (4x+4)²-(-x-3)(5x-4)
A = 16x² + 32x + 16 - (- 5x² - 11x + 12)
A = 16x² + 32x + 16 + 5x² + 11x - 12
A = 21x² + 43x + 4
B = (2x+4)(2x+5)+(9x-6)²
B = 4x² + 18x + 20 + 81x² - 108x + 36
B = 81x² - 90x + 56
C = (5x-4)(5x+4)-(6x-3)²
C = 25x² - 16 - (36x² - 36x + 9)
C = 25x² - 16 - 36x² + 36x - 9
C = - 11x² + 36x - 25
D = (3x-7)²- (10x+8)²
D = 9x² -42x + 49 - (100x² + 160x + 64)
D = 9x² -42x + 49 - 100x² - 160x - 64
D = - 91x² - 202x - 15
Voilà ^^
