Expand
4x^{2}-28xy+49y^{2}
Evaluate
\left(7y-2x\right)^{2}
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49y^{2}-28yx+4x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(7y-2x\right)^{2}.
49y^{2}-28yx+4x^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(7y-2x\right)^{2}.
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