Hi,

I would like some help with this.

The equation is given.

Show that one of the roots are i.

So i verified that i is indeed a root. And since complex roots are "mirrored", another root must be -i.

The factor theorem.

Then i factored the equation using polynomial division and the result is

the second bracket is a simple quadratic.

=

This is where i get it wrong, isn't the square root expression supposed to evaluate to 2i ?

The correct answer is however, the result im getting is

Any ideas?