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