Expand
x^{2}+14x+39
Evaluate
\left(x+7\right)^{2}-10
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x^{2}+14x+49-10
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+7\right)^{2}.
x^{2}+14x+39
Subtract 10 from 49 to get 39.
x^{2}+14x+49-10
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+7\right)^{2}.
x^{2}+14x+39
Subtract 10 from 49 to get 39.
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