Expand
49a^{2}-42ab+9b^{2}
Evaluate
\left(7a-3b\right)^{2}
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49a^{2}-42ab+9b^{2}
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(7a-3b\right)^{2}.
49a^{2}-42ab+9b^{2}
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(7a-3b\right)^{2}.
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