Evaluate
\left(2x+7y\right)^{2}
Expand
4x^{2}+28xy+49y^{2}
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1\left(4x^{2}+28xy+49y^{2}\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+7y\right)^{2}.
4x^{2}+28xy+49y^{2}
Use the distributive property to multiply 1 by 4x^{2}+28xy+49y^{2}.
1\left(4x^{2}+28xy+49y^{2}\right)
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+7y\right)^{2}.
4x^{2}+28xy+49y^{2}
Use the distributive property to multiply 1 by 4x^{2}+28xy+49y^{2}.
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