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16x^{2}+49y^{2}
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16x^{2}+49y^{2}
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16x^{2}-56xy+49y^{2}+56xy
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(4x-7y\right)^{2}.
16x^{2}+49y^{2}
Combine -56xy and 56xy to get 0.
16x^{2}-56xy+49y^{2}+56xy
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(4x-7y\right)^{2}.
16x^{2}+49y^{2}
Combine -56xy and 56xy to get 0.
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