Let A and B be vector spaces, (which turn out to be real btw) that have ordered bases alpha=(a1,a2,a3) and beta = (b1,b2,b3,b4). The matrix T: A->B is: 2 9 7 4 5 7 9 4 3 2 8 3 work out the alpha coord of a1+a2+a3 and hence or otherwise find T(a1+a2+a3) relative to b1,b2,b3,b4