Question 164280
{{{10^2+x^2=50^2}}}
{{{x^2=50^2-10^2}}}
{{{x^2=2500-100}}}
{{{x^2=2400}}}
{{{x=0 +- sqrt(4*6*100)}}}
{{{x=0 +- 2*10*sqrt(6)}}}
{{{x=0 +- 20*sqrt(6)}}}
If this is a length, then only use the positive value.
{{{x=20*sqrt(6)}}}