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
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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 $\displaystyle B^{-1} = A$ .... Then $\displaystyle BC = A \Rightarrow B^{-1} B C = B^{-1} A \Rightarrow C = B^{-1} A = A^2$.
wait, why does that equal A^2
Originally Posted by positiveion wait, why does that equal A^2 You're meant to join the dots. Substitute $\displaystyle B^{-1} = A$.
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