To be 5 units away from a point means that it is on a circle with radius = 5 and center = (-1,0).
The equation is: (y - -1)2 + (x - 0)2 = 52
(y + 1)2 + x2 = 25
Placing (2, n) into the equation: (2 + 1)2 + n2 = 25
9 + n2 = 25
n2 = 16
So, either n = 4 or n = -4.