1. The problem statement, all variables and given/known data Find d(u, v), where the inner product is defined by the matrix [1 2] [-1 3] and u = (-1, 2), v = (2, 5) 2. Relevant equations <u, v> = Au . Av d(u, v) = abs(u - v) 3. The attempt at a solution I first tried to find the resulting inner product from the matrix in terms of an equation: I got it to be: 2u1v1 + 13u2v2 Then I simply found u - v, which came to be (-3, -3) And thus d(u, v) = <-3, -3>0.5 This, in terms of the relevant inner product, is: [2(9) + 13(9)]0.5 Unfortunately, the books answer does not agree? It says it is 3 times root 13. I get root 135?