1. The problem statement, all variables and given/known data Find (u• v) 2 + ||u × v||2 , given ||u|| = 5 and ||v|| = 3 2. Relevant equations u•v=||u|| ||v|| cos(x) u×v=||u|| ||v|| sin(x) 3. The attempt at a solution Using these two equations I squared them both, brought them together and ended up with 225cos2(x) + 225sin2(x) and received a final answer of 225. Am I correct in my math? Why is it that if you square both the dot product and the cross product you just get the two magnitudes squared and multiplied together?