Evaluate
\left(2-7x\right)^{2}
Expand
49x^{2}-28x+4
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\left(2-7x\right)^{2}
Multiply 2-7x and 2-7x to get \left(2-7x\right)^{2}.
4-28x+49x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2-7x\right)^{2}.
\left(2-7x\right)^{2}
Multiply 2-7x and 2-7x to get \left(2-7x\right)^{2}.
4-28x+49x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(2-7x\right)^{2}.
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