Posted by Ray on Tuesday, September 20, 2011 at 7:28pm.
x^2=70^2-55^2
x= +- sqrt above.
Thanks so much! I should have thought of the pythagorean therom, but why x^2=70^2-55^2 rather than x^2+(-55^2)=70^2?
They both are the same thing. Solve for x^2 in your equation...
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