Question

Determine if the given matrices are inverses. Answer yes or no.

Answer 1

if you multiply them together and get an identity matrix

Answer 2

multiply them together?

Answer 3

identity matrix "I" look something like this \[\left[\begin{matrix}1 & 0 \\ 0 & 1\end{matrix}\right]\]

Answer 4

If \[AB=BA = I\]
then matrix A is an inverse of matrix B

so yes, multiply them together and see if you get the 1 0 0 1 thing

Answer 5

the identical ones? like so ill multiply 6 with one and 5 with 2.5?

Answer 6

oh... now you're asking about how to multiply matrices

Answer 7

no i thought thats what you meant

Answer 8

im refering to matrix multiplication, not dot product or whatever thats called

Answer 9

\[A= \left[\begin{matrix}a & b \\ c & d\end{matrix}\right]\]
\[B=\left[\begin{matrix}e & f \\ g & h\end{matrix}\right]\]
AB=C
\[C=\left[\begin{matrix}ae+bg & af+bh \\ ce+dg & cf+dh\end{matrix}\right]\]

Answer 10

so THATS what i do?

Answer 11

yes, it's not as difficult as it seems.

Answer 12

i see

Answer 13

can someone check it

Answer 14

my problem i mean

Answer 15

So what did you get? We cannot check if work is not posted...lol

Answer 16

true