Can someone help me solve this Calculus?

I was walking to class and was like, I forgot to divide by the power.

“69” omg woot !!1!!! what a funny joke.

I was going to turn around, log back in, and change it but decided since I couldn’t get it right on the first try I sucked and needed to get to class on time. It bothered me through the first half of the class.

Then I realized, heh, I’m not the one that failed out of engineering…