Algebra-2

Since the function has a y-intercept at (0, -15), when x = 0, f(x) = -15.

Substituting these values into f(x) = (x - a)(x - b), we get -15 = (0 - a)(0 - b), which simplifies to ab = -15.

Also, since one x-intercept is at (5, 0), either a = 5 or b = 5.