Write a polynomial function of least degree with integral coefficients that has the given zeros. -5, 3i

Solving for the polynomial function of least degree with integral coefficients whose zeros are -5, 3i   We have:
x = -5 Then x + 5 = 0 Therefore one of the factors of the polynomial function is (x + 5)
Also, we have:
x = 3i
Which can be rewritten as:
x = Sqrt(-9)
Square both sides of the equation:
x^2 = -9
x^2 + 9 = 0 Therefore one of the factors of the polynomial function is (x^2 + 9)
The polynomial function has factors: (x + 5)(x^2 + 9)
= x(x^2 + 9) + 5(x^2 + 9) = x^3 + 9x + 5x^2 = 45 Therefore, x^3 + 5x^2 + 9x – 45 = 0 f(x) = x^3 + 5x^2 + 9x – 45   The polynomial function of least degree with integral coefficients that has the given zeros, -5, 3i is f(x) = x^3 + 5x^2 + 9x – 45