Finding $y$ In Calculus(Area) Problem?

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Find the number b such that the line $y=b$ divides the region bounded by the curves $y = x^2$ and $y = 4$ into two regions with equal area.

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Integrate the value of the function between the curve and the y axis. You can ignore the second quadrant since it is symmetric

$ \int_0^k \sqrt{y}dy = \int_k^4\sqrt{y}dy$

Just solve for y and you would get the answer