1.x^2(x+3)=0
x^2=0 x+3=0
x=-3
2.x^3+x^2+7x-x^2-x-7=0
x^3+7x-7=0
x^3+7x=7
x(x^2+7)=7
x=7 x^2+7=7
x^2=0
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Answers & Comments
1.x^2(x+3)=0
x^2=0 x+3=0
x=-3
2.x^3+x^2+7x-x^2-x-7=0
x^3+7x-7=0
x^3+7x=7
x(x^2+7)=7
x=7 x^2+7=7
x^2=0