Simplify \( (u+4)(u-1) - (u-3)(u+6)\)
To do this, let's first expand. (i couldn't find an easier way...)
So, (u+4)(u-1)-(u-3)(u+6) is u^2+3u-4-(u^2+3u-18), which is 14.
PS After some thought about the answer I got, I think there might be an easier way....but i dont see it yet....