Answer:
Step-by-step explanation:
I'm going to guess that you mean 3x^2
3x^2 - 30x - 72 Take out 3 as a common factor
3(x^2 - 10x - 24)
This factors into
3(x - 12)(x + 2)
If you have a common factor, take it out. It makes finding an answer that much easier.
