quadratic functions

Question

Given that -5 is a zero of the function , find the other zeros, and write  in factored form

Answer 1

x=0 is another zero. Just plug in x=0 and f(x) =0

x(x^2+8x+15)=x(x+5)(x+3)

the 3rd zero is x=-3

0,-3 and -5 are the 3 zeroes