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4a^{2}+49b^{2}
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4a^{2}+49b^{2}
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28ab+4a^{2}-28ab+49b^{2}
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(2a-7b\right)^{2}.
4a^{2}+49b^{2}
Combine 28ab and -28ab to get 0.
28ab+4a^{2}-28ab+49b^{2}
Use binomial theorem \left(p-q\right)^{2}=p^{2}-2pq+q^{2} to expand \left(2a-7b\right)^{2}.
4a^{2}+49b^{2}
Combine 28ab and -28ab to get 0.
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