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Sagot :

Bonsoir,

(4x - 1)(5x + 2) - (4x - 1)(x + 3)

(4x - 1)(5x + 2)  = 20x² +8x -5x -2 = 20x² +3x -2

(4x - 1)(x + 3) = 4x² +12x -x -3

20x² +3x -2 -( 4x² +12x -x -3 )=

20x² +3x -2 - 4x² -12x +x +3 =

16x² -8x =1

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