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Marianapatru
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a) (x-1) (x+1)-x(x+2)=x-10
b)x(x+5)-(x-2)(x+9)=3(x+1)-1
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Răspuns :

Renatemambouko
a) (x-1) (x+1)-x(x+2)=x-10
x²-1 -x²-2x=x-10
-1 -2x=x-10
3x=9
x=3 


x(x+5)-(x-2)(x+3)=3(x+1)-1 
x²+5x-(x²-2x+3x-6)=3x+3-1
x²+5x-x²-x+6=3x+2
4x-3x=-6+2
x=-4

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