hey guys.. kinda confused on how to do this...

what values of k will make AB=BA

A = 2 5

-3 1

B= 4 -5

3 k

what i did was multiply them together, seperately, and then tried to equate the k... didnt work

thanks!

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- September 21st 2009, 06:39 PMmpl06cfind a value so that ab=ba
hey guys.. kinda confused on how to do this...

what values of k will make AB=BA

A = 2 5

-3 1

B= 4 -5

3 k

what i did was multiply them together, seperately, and then tried to equate the k... didnt work

thanks! - September 21st 2009, 06:44 PMartvandalay11
what you did should have worked, you should get 6-3k=-9 and 5k-10=15

- September 21st 2009, 06:45 PMmpl06c
the answer is k-5.. how do u get that then?

- September 21st 2009, 06:46 PMmpl06c
nevermind i got it... thanks!