SOLUTION: How do you factor the expression: 9x^2-54 ? I'm confused because 9 is a perfect square, but 54 is not. Is it just unfactorable?

Question 602606: How do you factor the expression: 9x^2-54 ?
I'm confused because 9 is a perfect square, but 54 is not. Is it just unfactorable?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
You can factor out the GCF 9 to get 9x^2-54 = 9(x^2-6), but that's as far as you can go because 6 is not a perfect square.