I'm having problems solving this one. Please help
The degree three polynomial f(x) with real coefficients and leading coefficient 1, has 4 and 3 + i among its roots. Express f(x) as a product of linear and quadratic polynomials with real coefficients.
f(x) = (x+4)(x^2+6x+10)
f(x) = (x-4)(x^2-6x-9
f(x) = (x-4)x^2-6x+10)
f(x) = (x-4)(x^2-6x+9)