Question

How do you simplify `5i^4 + 3i^2 + 4i^7 - 4`?

Answer 1

`-2-4i`

Explanation:

We may use the fact that `i^2=-1` to write the following

`5i^4+3i^2+4i^7-4=5(i^2*i^2)+3i^2+4(i^2*i^2*i^2*i)-4`

`=5-3-4i-4`

`=-2-4i`