Question 695367
The distance formula when coordinates are given
{{{d= sqrt((x1-x2)^2+(y1-y2)^2)}}}

where (x1,y1) and (x2,y2) are the co ordinates

we plug the values in the equation

{{{d= sqrt((11-x)^2+(-14-10)^2)}}}

{{{d= sqrt((121-22x+x^2)+(-24)^2)}}}

{{{25= sqrt(121-22x+x^2+576)}}}

square both sides
{{{625=121-22x+x^2+576}}}

{{{x^2-22x+72=0}}}

{{{x^2-18x-4x-72=0}}}
{{{x(x-18)-4(x-18)=0}}}

(x-18)(x-4)=0

x= 18 OR 4