Question 478385
a = x + 2, b = 6x − 1, c = 6x 
(x+2)2+(6x-1)2=(6x)2
x2+4x+4+36x2-12x+1=36x2
x2-8x+5=0
*[invoke quadratic "x", 1, -8, 5 ]
x=7.3166247903554 or 0.6833752096446
Throwing out the second answer, we get x=7.31662479..