Find the arc length in the second quadrant of the curve

x^(2/3) + y^(2/3) = 4 from x = -8 to x = -1.

Ok what I'm thinking i should do is:

y^(2/3) = 4 - x^(2/3)

But here's where I get stuck.

I'm thinking I should ^(1/6) both sides, but that gets really ugly. It seems to me there should be an easier way to set this up.

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