Could you help me with the following problem, I don't understand how to do it.

Question

Find an nth degree polynomial function with real coefficients satisfying the given conditions.

1. n=3; 3 and i are zeros; f(2)=20

Answer 1

f(x) = (x-3)(x-1)(x-a)

That function must be zero when x = 1 or 3.

Select the constant a so that f(2) = 20
(-1)(1)(2-a) = 20
a-2 = 20
a = 22

Answer 2

Nhbggtttitirriri