Find the distance from the point Q(5, -2, 3) to the plane 4x - y + 4z = 8.
(Note that if P is a point on the plane ax + by + cz = d, then the distance from any point Q to the plane equals the length of the orthogonal projection of PQ onto a vector n = (a,b,c) normal to the plane. This can be expressed as d = $$\frac{|PQ \cdot n|}{|n|}$$).
The distance is