S let k be the set of quaternions, that i elements the form q = a +bi+cj + dk a, b,c,d are elements of R. and with calculations where the rules as _ j = K= -1 ij = K = - ji jk = i = - kj = j =-ik that K is Isomorphic with the ring consisting 4x4 matrices on the form ki Show of all P550 -b-C -d b -d