SVP aider moi !!! A= (3x+4)(5x-2)-4(5x-3) ; B= x(5x+7)-(2x-1)(-5x+4) Montrer que A=B.

A= (3x+4)(5x-2)-4(5x-3) A = 15x² - 6x + 20x - 8 - 20x + 12 A = 15x² - 6x + 4 B= x(5x+7)-(2x-1)(-5x+4) B = 5x² + 7x - (- 10x² + 8x + 5x - 4) B = 5x² + 7x + 10x² - 8x - 5x + 4 B = 15x² - 6x + 4 Montrer que A=B. A = B Car 15x² - 6x + 4 = 15x² - 6x + 4