Evaluate
x\left(x+2\right)
Expand
x^{2}+2x
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x^{2}+2x+1-1
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+1\right)^{2}.
x^{2}+2x
Subtract 1 from 1 to get 0.
x^{2}+2x+1-1
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+1\right)^{2}.
x^{2}+2x
Subtract 1 from 1 to get 0.
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