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Sagot :

Salut !

(x+2)(5+x) = 5x+x²+10+2x = x²+7x+10

(2x+3)(3x+1) = 6x²+2x+9x+3 = 6x²+11x+3

(5x-1)(2-3x) = 10x-15x²-2+3x = -15x²+13x-2

(-2-3x)(5x-3) = -10x+6-15x²+9x = -15x²-x+6

LIXYSAE

Réponse:

a)x^2+7x+10

b)6x^2+11x+3

c) -15x^2+7x-2

d) -15x^2-19x+6

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