Question
Solve:
$x^4-625$
 

Answer

$x^4-625$
$=\left(x^2\right)^2-25^2$
$=\left(x^2+25\right)\left(x^2-25\right)$
$=\left(x^2+25\right)\left(x^2-5^2\right)$
$=\left(x^2+25\right)(x+5)(x-5)$

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