Answer
They are the same.
Work Step by Step
The zeros of a function are where the function intersects $y = 0$ (otherwise known as the "x-axis"). For the second function, plug in $y$ as $0$
$x^2-2x-15 = 0$
This is the exact same equation as the first equation given. The roots of this equations are the zeros. The roots of the first equation is where the equation is true. The zeros of a function are where the function intersects $y = 0$ (otherwise known as the "x-axis"). For the second function, plug in $y$ as $0$
$x^2-2x-15 = 0$ The roots of the first equation and the zeros of the second function are equal.
