Question

if -i^4=-1 then would -xi^4 be 2x?

Answer 1

-xi^4

-x(1)

-x

So -xi^4 = -x and not 2x

Answer 2

awesome thanks also: when (x+i)(x-i) is factored it gives me (x^2-i^2) so would that polynomial stand or would I have to add 1(-i^2=1) onto x^2?

Answer 3

@jim_thompson5910

Answer 4

I would do

(x+i)(x-i)

x^2 - i^2

x^2 - (-1)

x^2 + 1

Answer 5

ok thanks