I'm trying to find a common denominator right now for this part of the problem:
Don't I multiply the denominators together? Thus making it?
Now since I can subtract the numerators it means I get 9.
That ends up as the right answer for the exponent of this:
However, in the solution it baffles me because they got the following:
It looks like they just multiplied it by two, but I didn't think that was how you got a common denominator...
I'm aware of two methods to finding LCD's. This site explains both: How To Find The Least Common Denominator (LCD) .