I was wondering if anyone can help me figure out a mistake I'm making in this problem: calculate the arc length of y=x^(1/3) over [3,4]. I am familiar with the formula and once I square the derivative and put it back into the formula, I attempted u-substituion. But now I am stuck.

I was wondering if anyone can help me figure out a mistake I'm making in this problem: calculate the arc length of $y=x^{1/3}$ over $[3,4]$. I am familiar with the formula and once I square the derivative and put it back into the formula, I attempted u-substituion. But now I am stuck.