# pre-calc

posted by
**melissa**
.

Quest:

show that i (imaginary) is a zero of f (x)= x^3+ (3-i)x^2 - 4ix -1

Plug in i for x and add up the terms. You should get zero. Remember that i^2 = -1

posted by
**melissa**
.

Quest:

show that i (imaginary) is a zero of f (x)= x^3+ (3-i)x^2 - 4ix -1

Plug in i for x and add up the terms. You should get zero. Remember that i^2 = -1