Evaluate
\left(3x-7y\right)^{2}
Expand
9x^{2}-42xy+49y^{2}
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\left(3x-7y\right)^{2}
Multiply 3x-7y and 3x-7y to get \left(3x-7y\right)^{2}.
9x^{2}-42xy+49y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x-7y\right)^{2}.
\left(3x-7y\right)^{2}
Multiply 3x-7y and 3x-7y to get \left(3x-7y\right)^{2}.
9x^{2}-42xy+49y^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(3x-7y\right)^{2}.
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