Question

Find the zeros of the function.

f(x) = 9x2 + 6x - 8

Answer 1

Just set it equal to zero and solve using the quadratic equation.

Answer 2

The zeros of a function are when y = 0, so set the right side of the equation equal to 0. Then factor; the right side becomes (3x-2)(3x+4). Set both of those parentheses equal to zero to find the zeros, or roots, of the equation. 
x = 2/3, x = -4/3