Matrices

**positiveion** · January 15th 2009, 03:05 AM

Oh I forgot to mention the answer says that it is

(14..25)
(5....9 )
^ sorry if that doesn't look right
it's supposed to be a matrice

**mr fantastic** · January 15th 2009, 03:12 AM

Originally Posted by positiveion

Oh I forgot to mention the answer says that it is

(14..25)
(5....9 )
^ sorry if that doesn't look right
it's supposed to be a matrice

You're meant to realise that the result of AB tells you that $B^{-1} = A$ ....

Then $BC = A \Rightarrow B^{-1} B C = B^{-1} A \Rightarrow C = B^{-1} A = A^2$ .

**positiveion** · January 15th 2009, 03:16 AM

wait, why does that equal A^2

**mr fantastic** · January 15th 2009, 03:20 AM

Originally Posted by positiveion

wait, why does that equal A^2

You're meant to join the dots. Substitute $B^{-1} = A$ .

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