Répondre :
A. x² - 8x² - 9x² - 3x - c + 6x - 12 + 1 = -7x^2 -9x^2 +3x - c -11 = -16 x^2 + 3x - c -11
= x ( 3 - 16x ) - c - 11
B. 5x² - 9x + 2 - 7x² - 5x + 4 - x² + x = -3 x^2 - 13x +6 = x (-3x - 13) + 6
= x ( 3 - 16x ) - c - 11
B. 5x² - 9x + 2 - 7x² - 5x + 4 - x² + x = -3 x^2 - 13x +6 = x (-3x - 13) + 6