Question

How do you simplify `(1+sqrt7i)(-2-sqrt5i)`?

Answer 1

`-2+sqrt(35)-(2sqrt(7)+sqrt(5))i`

Explanation:

We are Using that `i^2=-1`
so we get by expanding

`-2-2sqrt(7)i-sqrt(5)i+sqrt(35)`
this equal to

`-2+sqrt(35)-(2sqrt(7)+sqrt(5))i`