Write a cubic function with zeros of - 3, - 5 and 2

For zeroes of r1, r2, r3, the factors of the function, f (x) are

(x-r1) (x-r2) (x-r3)

zeroes of - 3,-5,2

(x - (-3)) (x - (-5)) (x-2) =

(x+3) (x+5) (x-2)

f (x) = (x+3) (x+5) (x-2)

expanded

f (x) = x³+6x²-x-30