1. ## Hard Algebra/Trig Problem

Thanks

EDIT: The left side of the equation should be 18.75/2 instead of just 18.75

2. Originally Posted by stones44

Thanks

EDIT: The left side of the equation should be 18.75/2 instead of just 18.75
solution has to be in the interval $-7.5 \le x \le 7.5$

my calculator says $x \approx 5.0547354$

3. Yeah, i found out that was the answer using wolfram alpha..but can anyone show me how?

http://www.wolframalpha.com/input/?i=-%289.375-%28%2856.25pi%29%2F4%29%29%3D%2828.125arcsin%28%28 1%2F7.5%29x%29%29%2B%283.75x*sqrt%281-%28%281%2F56.25%29x^2%29

How did the come up with the part in the "Result" section?