Graph the following functions and determine for each function its domain of definition, discontinuities, extremal points, intervals of increase and decrease, points of inflection of its graph, the direction of concavity, and also the asymptotes.

942. y= V 4-x2 8 943. y = x V x2- 4 X 944. y= CA X 945. y= 3 (x - 2)2 946. y = xe-*