Can someone help me with this math eqation

Identify the zeros of the function h(x) = x2 + 2x.

h(x) = x^2 + 2x = x(x+2) = 0
=> x=0, x=-2

f(x) = x^2 − 2x − 15 = (x-5)(x+3) = 0
=> x=5, x=-3