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Réponse :

bonjour

Explications étape par étape :

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

=20x-10x²-10x+15x

=-10x²+25x

8+2x+5x(3-x)

=8+2x+15x-5x²

=-5x²+17x+8

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

=5x²+15x+6x+6-5x+3

=5x²+16x+9

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

=-6x-15x²-4+8x

=-15x²+2x-4

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

=x-2x²-15x²-12x

=-17x²-11x