Vector A? has a magnitude of 8 units and makes an angle of 45 with the positive x-axis. Vector B? also has a magnitude of 8 units and is directed along the negative x-axis. Using graphical methods,...

Vector A? has a magnitude of 8 units and makes an angle of 45 with the positive x-axis. Vector B? also has a magnitude of 8 units and is directed along the negative x-axis. Using graphical methods, find (a) the vector sum A? + B? and (b) the vector difference A? - B?