# Math Help - matrix question 2

1. ## matrix question 2

given matrix A =

1st row 2 1 0
2nd row 3 1 2
3rd row 1 0 5

a)write matrix 3A

1st row 6 3 0
2nd row 9 3 6
3rd row 3 0 15

b)find the det A by expanding by row 1.
my ans:-3

plse check for me..

2. Originally Posted by Faz
given matrix A =

1st row 2 1 0
2nd row 3 1 2
3rd row 1 0 5

a)write matrix 3A