Question 9 Consider a 3 x 3 upper triangular matrix C with main diagonalelements -8, 7 and 8.Suppose that matrix C was obtained from a matrix B by making thefollowing row operations on B:• multiplying row 3 of B by 2, and• adding 5 times row 2 to row 1.What is the determinant of B?det (B)=