Question

How do you simplify `(sqrt 5 - 2)(sqrt 5 - 4)`?

Answer 1

I found: `13-6sqrt(5)`

Explanation:

You can multiply to get:
`(sqrt(5)-2)(sqrt(5)-4)=sqrt(5)sqrt(5)-4sqrt(5)-2sqrt(5)+8=`
`=5-6sqrt(5)+8=13-6sqrt(5)`