5x (2x - 1)
5x*2x =10x²
5x*-1 = -5x
=> 10x² -5x
(3x + 8) (4-x)
3x*4 = 12x
3x*-x = -3x²
8*4 = 32
8*-x = -8x
=> 12x -3x² +32-8x
=-3x² +4x +32
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Bonjour;
5x (2x - 1)
5x*2x =10x²
5x*-1 = -5x
=> 10x² -5x
(3x + 8) (4-x)
3x*4 = 12x
3x*-x = -3x²
8*4 = 32
8*-x = -8x
=> 12x -3x² +32-8x
=-3x² +4x +32