9x² - 4

Factor the quadratic completely

(3x - 2) * (3x + 2)

Step-by-step explanation:

I don't know how much more i can explain, except that you could use the quadratic formula to get your zeroes and then put it in your answer. But this one is obvious. Whenever there isn't an x term and you're subtracting the constant term, it's usually (ax - b) (ax + b)