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Sagot :

Bonjour, réponse exercice 2 page 142 :

a) (x-1)(2x+5)
2x²+5x-2x-5
2x²+3x-5

b) (-x+1)(x-1)
-x²+1x+1x-1
−x²+2x−1

c) (4-2x)(5x-9)
20x-36-10x²+18x
-10x²+38x-36

d) (-3-2x)(-6-3x)
18+9x+12x+6x²
6x²+21x+18

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