# Factor 81-16x^4

Rewrite as .
Rewrite as .
Since both terms are perfect squares, factor using the difference of squares formula, where and .
Simplify.
Remove parentheses.
Rewrite as .
Rewrite as .
Since both terms are perfect squares, factor using the difference of squares formula, where and .
Factor.
Multiply by .
Remove unnecessary parentheses.
Factor 81-16x^4

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