Question

How do you simplify `(-1+4i)(-1-4i)`?

Answer 1

`17`

Explanation:

FOIL:

`1+4i-4i-16i^2`

Subtract:

`1-16i^2`

`i^2=-1`

So

`1-16(-1)`

Multiply:

`1+16`

Add:

`17`