Question

1. The complex number - 3 + 2i is one zero for a polynomial function. Which complex number must also be a zero for this function?
O -3+2i
O 3+2i
O -3- 2i
O 3-2i
2. Find the zeroes of the polynomial function f (x) = 2x^3 + 2x^2 -19x + 20.
3. Find all the zeroes of the function f(x) = 11x^2+ x+5.

Answer 1

#1. complex roots occur in conjugate pairs, so ...
#2. (x+4)(2x^2-6x+5) so you will need the quadratic formula
#3. again, use the quadratic formula, since the discriminant is negative