Question

The question is attached.

Answer 1

do you know how to perform this matrix multiplication?
top left entry will be
\[a_{1,1}=2\times (-3)+5\times 7\]

Answer 2

\[\left[\begin{matrix}-6 & -45 \\ 42 & 16\end{matrix}\right]\]

is this the answer?

Answer 3

no that is not what i got

Answer 4

\[a_{1,1}=2\times (-3)+5\times 7=-6+35=29\]

Answer 5

\[a_{1,2}=2\times (-9)+5\times 4=-18+20=2\]

Answer 6

I THINK I GOT IT. HOLD ON.

Answer 7

ok good.

Answer 8

\[\left[\begin{matrix}29 & 2 \\ -46 & -70\end{matrix}\right]\]

Answer 9

?

Answer 10

yes!

Answer 11

:D thanks!

Answer 12

in the future if you want to cheat you can do this
note the syntax (how i entered the matrix)
http://www.wolframalpha.com/input/?i= {{2%2C5}%2C{6%2C-4}}*{{-3%2C-9}%2C{7%2C4}}

Answer 13

you will have to copy and paste the link

Answer 14

oh haha, ok thank you :P