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4x^{2}+49
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4x^{2}+49
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4x^{2}+28x+49-28x
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+7\right)^{2}.
4x^{2}+49
Combine 28x and -28x to get 0.
4x^{2}+28x+49-28x
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(2x+7\right)^{2}.
4x^{2}+49
Combine 28x and -28x to get 0.
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