Question

If A= -1 6 4 and B= 3 6 3 find BA
2 3 1 1 6 9
2 3 -7 3 6 4

Answer 1

For the entry \(e_{ij}\) dot the i'th column with the j'th row.

Answer 2

so the very first entry will be \[-1*3+6*1+4*3\]

Answer 3

understand?

Answer 4

so you just multiply?

Answer 5

Do you know what the dot product of two vectors is?

Answer 6

i dont

Answer 7

https://www.khanacademy.org/math/precalculus/precalc-matrices/matrix_multiplication/v/multiplying-a-matrix-by-a-matrix

Answer 8

AB \(\ne\) BA, in general

Answer 9

\[[AB]_{11}=-1(3)+6(1)+4(3)\]
\[[BA]_{11}=3(-1)+6(2)+3(2)\]