Question 1038043
I assume it's a right triangle and you need to solve for {{{x}}}.
Use Pythagorean theorem,
{{{14^2+x^2=(3x)^2}}}
{{{196+x^2=9x^2}}}
{{{8x^2=196}}}
{{{x^2=196/8}}}
{{{x^2=49/2}}}
{{{x=7/sqrt(2)}}}
{{{highlight(x=(7/2)sqrt(2))}}}