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