Rank(ab)

I am given the equations and know that the 3x3 matrix as a and then the numbers that are after my equal sign I assigned that b so it is a 3x1 and i have found the rank for a but i dont know how to do the rank(ab) i have tried typing it a few different was including rank(a b) rank(ab) rank (a;b) and none of them work

Answer 1

[Steven Lord]

Do you mean you want to augment the matrix a with the vector b?

A = [1 2 3; 4 5 6; 7 8 9]

A = 3×3

1 2 3 4 5 6 7 8 9

b = [10; 11; 12]

b = 3×1

10 11 12

Ab = [A, b]

Ab = 3×4

1 2 3 10 4 5 6 11 7 8 9 12