Factor x to the power of four minus eighty-one

Factor x^4-81
Rewrite as .
Rewrite as .
Since both terms are perfect squares, factor using the difference of squares formula, where and .
Simplify.
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Rewrite as .
Factor.
Tap for more steps...
Since both terms are perfect squares, factor using the difference of squares formula, where and .
Remove unnecessary parentheses.
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