A square matrix of order n , A = [ aij ], is called upper triangular if aij = 0

A )  MN will be multiplying Matrix M and Matrix N

hence MN =

B ) |M| is a product of its diagonal elements because  the matrix of M is equal | M | = a1b2c3 from this | M | is a product of its diagonal elements   for an value of n found in the

Step-by-step explanation:

 = M

M is a upper triangle with an order of three ( 3 )

N=

N is also an upper triangle with an order of three ( 3 )

( A )  MN will be multiplying Matrix M and Matrix N

hence MN =

from the product of MN it is clear that MN is also an upper triangle square matrix as well

( B ) |M| is a product of its diagonal elements because  the matrix of M is equal | M | = a1b2c3 from this | M | is a product of its diagonal elements   for an value of n found in the matrix