A force a 10 N acting a 0 degree and a force of 20 N acting at 225 degrees are applied to an object. What is..?

Required magnitude = sq rt[10^2 + 20^2 +2*10*20*cos (360-225)] = 14.73 N and should pull the object into the second quadrant. I am assuming that N is acting along positive x axis and 20 N is pulling in third quadrant.