Factor out of .

Rewrite as .

Factor out of .

Rewrite as .

Rewrite as .

Since both terms are perfect squares, factor using the difference of squares formula, where and .

Remove unnecessary parentheses.

Factor -16r^2+1

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# Factor -16r^2+1

Factor out of .

Rewrite as .

Factor out of .

Rewrite as .

Rewrite as .

Since both terms are perfect squares, factor using the difference of squares formula, where and .

Remove unnecessary parentheses.

Factor -16r^2+1