Evaluate
\left(x+3\right)^{2}+x
Expand
x^{2}+7x+9
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x+x^{2}+6x+9
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
7x+x^{2}+9
Combine x and 6x to get 7x.
x+x^{2}+6x+9
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
7x+x^{2}+9
Combine x and 6x to get 7x.
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