The image of a parabolic mirror is sketched on a graph. The image can be represented using the function y = 1/8x2 + 2, where x represents the horizontal distance from the maximum depth of the mirror and y represents the depth of the mirror as measured from the x-axis. How far away from the maximum depth is a point on the mirror that is 7/8 inches in depth?3 inches4 inches5 inches6 inch