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Originally Posted by tikki14

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First how about you get rid of the square root which also helps you get rid of the absolute sign on the right side.



This should simplify matters greatly. Try it and report back how things work out.

I like the approach, rpray, but note that the RHS squares to

4 - 4|a| + a^2

... then you can solve by the two cases for a. Otherwise, you lose one of the solutions.

Arcsine - you got me there! I stand corrected.

Thank you, rpray2007 and ArcSine! I tried something similar too, but I got struck at the modulus. Now I know what I have to do :)