Bonsoir,
A = (2x -1)² - (5x + 1)(6x - 3) + (8x² - 2)
A = (2x - 1)(2x - 1) - 3(5x + 1)(2x - 1) + 2(4x² - 1)
A = (2x - 1)(2x - 1) - 3(5x + 1)(2x - 1) + 2(2x + 1)(2x - 1)
A = (2x - 1)[2x - 1 - 3(5x + 1) + 2(2x +1)]
A = (2x - 1)(2x - 1 - 15x - 3 + 4x + 2)
A = (2x - 1)(-9x - 2)
