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Sagot :

Exercice 3:

A= (x+5) x (x+5)

= x2+5x+5x+25

=x2+10x+25

B= (2x-3) x (2x-3)

= 4x2-6x-6x+9

=4x2+12+9

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

= 7x2+3x-14x-1-3x-6

= 7x2-14x-7

D=20x-15x2+43x-51+12

= 15x2+63x-54

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