Expand
49x^{14}+126x^{7}+81
Evaluate
\left(7x^{7}+9\right)^{2}
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49\left(x^{7}\right)^{2}+126x^{7}+81
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(7x^{7}+9\right)^{2}.
49x^{14}+126x^{7}+81
To raise a power to another power, multiply the exponents. Multiply 7 and 2 to get 14.
49\left(x^{7}\right)^{2}+126x^{7}+81
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(7x^{7}+9\right)^{2}.
49x^{14}+126x^{7}+81
To raise a power to another power, multiply the exponents. Multiply 7 and 2 to get 14.
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