Factor
e^{4}\left(121e^{4}+49f^{6}-144e^{2}f^{6}\right)
Evaluate
49e^{4}f^{6}-144\left(ef\right)^{6}+121e^{8}
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e^{4}\left(121e^{4}f^{0}-144e^{2}f^{6}+49f^{6}\right)
Factor out e^{4}. Polynomial 121e^{4}-144e^{2}f^{6}+49f^{6} is not factored since it does not have any rational roots.
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