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LORIE4875
Bonjour alors
1) x(x+2)=x^2-1
=x^2+2x=x^2-1
2x=-1
x= -1/2

2)-2(x-3)=(x-1)(-2x-4)
-2x+6=-2x^2-4x+2x+4
-2x+6=-2x^2-2x+4
6=-2x^2+4
2x^2=4-6
2x^2=-2

Voilà :)

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