Fixing V and Finding U 2 points possible (graded) Now, assume we have 2 users, 3 movies, and a 2 by 3 matrix Y given by i [2 8 ? ?] 5] Our goal is to find U and V such that X = UV' closely approximates the observed ratings in Y. Assume we start by fixing V to initial values of 4, 2, 1)'. Find the optimal 2 x 1 vector U in this case. (Express your answer in terms of 2). First element of U is: The second element of U is