Factor
3\left(13+8a^{12}-5a^{212}\right)
Evaluate
39+24a^{12}-15a^{212}
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3\left(8a^{12}-5a^{212}+13\right)
Factor out 3. Polynomial 8a^{12}-5a^{212}+13 is not factored since it does not have any rational roots.
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