Evaluate
x\left(x+4\right)
Expand
x^{2}+4x
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x^{2}+4x+4-4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+2\right)^{2}.
x^{2}+4x
Subtract 4 from 4 to get 0.
x^{2}+4x+4-4
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+2\right)^{2}.
x^{2}+4x
Subtract 4 from 4 to get 0.
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