1. Finding Zeros

I'm reviewing for a math exam and i need help finding zeros again. =(
How many zeros do the following functions have?
a) y= 6x^2 -6x -9
b) f(x)= -6(x+3)^2 -2

2. Originally Posted by casey_k
I'm reviewing for a math exam and i need help finding zeros again. =(
How many zeros do the following functions have?
a) y= 6x^2 -6x -9
b) f(x)= -6(x+3)^2 -2
For zeros, you set the function equal to 0.

$6x^2-6x-9 = 0$

You can solve this using the quadratic equation:

$x = \frac{-b \pm \sqrt{b^2-4ac}}{2a}$

$-6(x+3)^2 - 2 = 0$

$-6(x^2+6x+9) - 2 = 0$

$-6x^2-36x-56 = 0$

Use the same formula.