Evaluate
\left(\left(4x+1\right)\left(7x^{2}+5x+1\right)\right)^{2}
Expand
784x^{6}+1512x^{5}+1233x^{4}+542x^{3}+135x^{2}+18x+1
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784x^{6}+1512x^{5}+1233x^{4}+542x^{3}+135x^{2}+18x+1
Square 1+9x+27x^{2}+28x^{3}.
784x^{6}+1512x^{5}+1233x^{4}+542x^{3}+135x^{2}+18x+1
Square 1+9x+27x^{2}+28x^{3}.
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