Expand
81x^{4}+126x^{3}+67x^{2}+14x+1
Evaluate
\left(9x^{2}+7x+1\right)^{2}
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81x^{4}+126x^{3}+67x^{2}+14x+1
Square 9x^{2}+7x+1.
81x^{4}+126x^{3}+67x^{2}+14x+1
Square 9x^{2}+7x+1.
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