How do you factor the expression $x ^9 - x ^7 y ^2$ ?

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Answer 1 · 2016-01-21T02:22:40

You can first take out the $x^7$ part, and work from there

$=x^7(x^2-y^2)$
Since the latter part is the difference of two squares:
$=x^7(x+y)(x-y)$

How do you factor the expression x ^9 - x ^7 y ^2x ^9 - x ^7 y ^2?