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Sagot :

Bonjour,

A =(x + 3)(2x - 3) - (2x - 3)2=

double, puis simple distributivité

x*2x = 2x²

x*-3 = -3x

3*2x= 6x

3*-3 = -9

2x*2 = 4x

-3*2 = -6

2x² -3x  +6x  -9 -( 4x -6) =

2x² -3x  +6x  -9 - 4x +6 =

2x² -x -3

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