Evaluate
\left(5a-7\right)^{2}
Expand
25a^{2}-70a+49
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\left(5a-7\right)^{2}
Multiply 5a-7 and 5a-7 to get \left(5a-7\right)^{2}.
25a^{2}-70a+49
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(5a-7\right)^{2}.
\left(5a-7\right)^{2}
Multiply 5a-7 and 5a-7 to get \left(5a-7\right)^{2}.
25a^{2}-70a+49
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(5a-7\right)^{2}.
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