bjr
A= -5(x²-3)+2x = -5x² + 15 + 2x = -5x² + 2x + 15 dans l'ordre :)
B= 4-(3x-2)² = 4 - (9x² - 12x + 4) = -9x² + 12x
C= (2x-5)(3x-2) = 6x² - 4x - 15x + 10 = 6x² - 19x + 10
D= 3(3x+5)(-2x+1) = (9x + 15) (-2x + 1) = -18x² + 9x - 30x + 15
= -18x² - 21x + 15