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2013-11-04T18:05:43+01:00
Bonsoir

F= 5(2x + 1)(3 - 4x)
F = 10x +5 (3 -4x)
F ) 30x -40x² +15 -20x
F = -40x² +10 x +15

G= 4( -x + 7)(3x - 7)
G = -4x +28 (3x -7)
G = -12x² +28x + 84x - 196
G = -12x²  + 112 x - 196

H= x(4x - 2)(5 - x)

H = (4x -2x) (5 -x)
H = 20x -4x² -10x +2x²
H = -2x² +10x