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