Factor
\left(9r^{4}+25\right)^{2}
Evaluate
\left(9r^{4}+25\right)^{2}
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\left(9r^{4}+25\right)^{2}
Use the perfect square formula, a^{2}+2ab+b^{2}=\left(a+b\right)^{2}, where a=9r^{4} and b=25. Polynomial 9r^{4}+25 is not factored since it does not have any rational roots.
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