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25x^{2}+4y^{2}
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25x^{2}+4y^{2}
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25x^{2}-20xy+4y^{2}+20xy
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-2y\right)^{2}.
25x^{2}+4y^{2}
Combine -20xy and 20xy to get 0.
25x^{2}-20xy+4y^{2}+20xy
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(5x-2y\right)^{2}.
25x^{2}+4y^{2}
Combine -20xy and 20xy to get 0.
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