So this is ?
I presume you immediately noticed that and .
Okay, that is becausei did -18.104.22.168.y^4.y^6
in the numerator
and you have 7.11.11.y.y^4 which is
in the denominator.
and you should see that one "11" in both numerator and denominator will cancel and that one "7" in both numerator and denominator will cancel so you have
Now, as always in mathematics, you can do that in several different ways. First, you can write, or imagine, that " " as 10 separate "y"s in the numerator and the " " in the denominator as 5 separate "y"s in the denominator and cancel 5 of them leaving " " in the numerator. Or you could "move" that "[itex]y^5[/itex]" into the numerator where it becomes " ". And then, of course,
you have . Finally, you could use the exponent law derived in that way- so that .