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Sagot :

ESUU

Réponse:

a) (3x-2)(5-x)-4x(x+6)

=15x-3x^2-10+x-4x^2-24

=-7x^2+16x-34

b) -3(2-2x)(6-2x)

=-3(12-4x-12x+4x^2)

=-36+12x+36x-12x^2

=-12x^2+48x-36

c) 2(x+3)(5x+1)

= 2(5x^2+x+15x+3)

=10x^2+2x+30x+6

=10x^2+32x+6

d)-2(x^2+1)(x-2)

=-2(x^3-2x^2+1-2)

=-2x^3+4x^2+2

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