Question

How do you simplify `(sqrt(5) + 4 )(sqrt(5) – 1)`?

Answer 1

`1 + 3sqrt5`

Explanation:

Let's multiply this out.

`(sqrt5 + 4)(sqrt5 - 1)`

`5 - sqrt5 + 4sqrt5 - 4`

`5 + 3sqrt5 - 4`

`1 + 3sqrt5`