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Sagot :

Bonjour,

A= (3x+2)(4x+5)

distributivité:

3x*4x= 12x²

3x*5 = 15x

2*4x = 8x

2*5 = 10

=> 12x²  + 15x+ 8x+ 10

= 12x² +23x +10

B= 2x+(4×-1)

= 2x+4x-1

= 6x -1

C=(7x-2)-(3x+1)

=  7x-2-3x -1

= 4x -3

D=-3(4×-9)

= -12 x + 27

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