1. Chemistry
2. General Chemistry
3. 224224

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What are the concentrations of each of the ions in a saturated solution of PbBr2, given the Ksp of PbBr2 is 2.1 x 10^-6?

I get stuck in solving this question when I get to the equation
4(x^3)=2.1 x 10^-6 and I don't know how to get to the answer
x = 8.07 x 10 ^-3 M which is supposedly the concentration of Pb 2+.

Really the problem is arithmetic here because I am required to do this problem by hand and can not use a calculator.