Polynomial Function

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

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

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

  • Polynomial Function -

    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

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