Question

Find a polynomial equation with real coefficients that has the given roots.

3 and -9i


x^3-?x^2+?x-?=0

Answer 1

Explanation:

(x - 3) (x - 9i) (x + 9i) = 0

(x - 3) (x² + 81) = 0

x³ - 3x² + 81x - 243 = 0