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