If the point A(a, 2) is equidistant from the points B(8,-2) andC(2,-2) find the value of a

If the point A(a, 2) is equidistant from the points B(8,-2) andC(2,-2)

1.	If the point A(a, 2) is equidistant from the points B(8,-2) andC(2,-2) find the value of a
Answer» Answer is 2 but how ? 5