Evaluate
x\left(x+14\right)
Expand
x^{2}+14x
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x^{2}+14x+49-49
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+7\right)^{2}.
x^{2}+14x
Subtract 49 from 49 to get 0.
x^{2}+14x+49-49
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+7\right)^{2}.
x^{2}+14x
Subtract 49 from 49 to get 0.
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