hello, can I get help with this,I'm stuck on it.

Compute the determinant of the matrix A, below, by using row operations to transform A to an upper- triangular matrix B. Then express the determinant of A as a multiple k of the determinant of B, and use this to compute the determinant of A. -9 -10 3 -5 A = 0 -3 -9 -9 0 -6 -2 0 -6 0 -9 10 0 0 B = 0 0 0 0 0 0. det(A) = k.det(B) = 0 . 0 0