i hope you can help i am soooo stuck here goes: a) A= 0 1 B= 1 1 c= 2 5 0 2 3 4 3 4A,B and c are matrices Evaluate AB and Ac (which I can do)
then
thanking you Hi Vikki, If A is invertible and AB=AC then B=C. This is true because if A is invertible,Êyou multiply both sides of the equation AB=AC from the left by A inverse to get IB=IC which simplifies to B=C sinceÊI is the identity matrix. This does not contradict what you did in part (a) (where AB=AC but B does not equal C) because the matrix A in your problem is not invertible (because of the column of zeroes). The words "if A is invertible"Êare very important in the statement underlined above. Leeanne
