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\[y=\sqrt(x^2+7x)\]

x(y) = 1/2 (-7±sqrt(4 y^2+49))

so far I have it down to \[x^2=y^2+7y \]

I'm just kind of confused

Confused about the `completing the square` step though?

yeah a little

\[y=(\frac{ 1 }{ 2 } (-7±\sqrt{(4 x^2+49)})\]

the answer prebz gives is the right one, is that what you got zepdrix?

Yah that's the same :) His just has the 1/2 factored out, so it looks nicer.