Evaluate
\left(1-7x\right)^{2}
Expand
49x^{2}-14x+1
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\left(-7x+1\right)^{2}
Multiply -7x+1 and -7x+1 to get \left(-7x+1\right)^{2}.
49x^{2}-14x+1
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(-7x+1\right)^{2}.
\left(-7x+1\right)^{2}
Multiply -7x+1 and -7x+1 to get \left(-7x+1\right)^{2}.
49x^{2}-14x+1
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(-7x+1\right)^{2}.
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