Find 3 matrices to multiply to A so that you obtain an upper triangular matrix That is find My M and My such that M M M A is an upper triangular matrix Let a b c be real numbers Define the following matrices A a a ab and C aaa 87c Recall that you cannot divide by zero a Show that A 1 is invertible is a 0 and ab State the pivots of A b Find two values for e such that C is not invertible