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Sagot :

Réponse:

tu dois factoriser.

A=.(7x+3)(x-5)

A= 7x^2-35x+3x-15

A=7x^2-32x-15

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

B= 3x^2-15x+2x-10-x-3

B= 3x^2-14x-13

C= (17-4x)(7+4x)

C= 119+61x-28x-16x^2

C= 16x^2+33x+119

x^2 c est x au carré

A=7xcarré-35x+3x-15 A=7xcarré-32x-15
B=(3xcarré-13x+10)-(x+3) = 3xcarré-14x+7
C=119+68x-28x-16xcarré = 118+40x-16xcarré

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