Answer:
5(x + 3)(x - 3)
Explanation:
Both terms in this expression have 5 in common---they both have a factor of 5. Therefore you can factor out a 5 like this:
5(x^2 - 9)
This can be even further factored. Find what two numbers multiply to -9 but add to 0. -3 and 3 are numbers that work. You can make x^2 - 9 become(x + 3) and (x - 3).
5(x + 3)(x - 3) is the final answer simplified completely.