Answer Happy

: 2.9. Theorem. Let f: V + U and g: U + W be linear transformations. Fix bases B, C, E in V,U, W respectively. Then [go f] = [ 91.1 i.e. the matric of the composition gof is the product of the matrices of g and f in the fixed bases. BE CE BC

Problem 4 (2 points): Let f: Pi + P2 be defined by p(x) + xp(2). Let g: P2 + P2 be defined by P(1) + p'(x). Let B = {1, 2} be the canonical basis in P1 and C = {1, 2,2%}be the canonical basis in P2. Compute (gºf) in two ways: (a) by finding gof directly and then computing its matrix; (b) by finding the matrices of f, g and using Theorem 2.9 in Notes (page 49). B+C