Bonjour
A = 3x -3
B = -8x² +6x
C = 4x² -9
D = 2x -3x -3 = -x -3
E = 6x -9 -2x² -4 = -2x² +6x -13
F = -3x -6 - ( -x² +x +2x -2 ) = -3x -6 +x² -x -2x +2 = -2x² -6x -4
G = (3x² +12x +8x +32) + (3x² +8x -3x -8) = 3x² + 18x +32 + 3x² +5x -8 = 6x² +23x +24
H = (15x -6x² -20 +8x) - ( -9x -36x +5x² +20x²) = -6x² +23x -20 - (25x² - 45x) = 6x² +23x -20 -25x² +45x = - 19x² + 68x - 20
