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So you would do:
\[\frac{3(4 + \sqrt{5})}{(4 + \sqrt{5})(4 + \sqrt{5})}\]

how do i do that

... Do what? The above is what you do. You have to multiply it out.

how do i do that?

... By multiplying?

For example, \(3(4 + \sqrt{5})\) = \(3\times 4 + 3\times \sqrt{5}\).

You can leave \(3\times \sqrt{5}\) as just \(3\sqrt{5}\).

and can you stop deleting my post :/

okay i only did that b/c i don't understand what your talking about !