Find the zeros of the function.

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

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

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