Question 1080376
{{{38^2=(X+1O)^2+X^2}}} PHYTHAGORA's theorem
solving
{{{2x^2+20X-1344=0}}}
X=21.5
When you solve the quadractic equation
X=21.5 
⇒={{{hyp^2=31.5^2+21.5^2=38}}}