If A = [1234] \left [ \begin{matrix} 1 & 2 \ 3 & 4 \end{matrix} ight ] B= [4735] \left [ \begin{matrix} 4 & 7 \ 3 & 5 \end{matrix} ight ] and AB-1 = [1a−35] \left [ \begin{matrix} 1 & a \ -3 & 5 \end{matrix} ight ] then a=?

Question

If A = [1234] \left [ \begin{matrix} 1 & 2 \ 3 & 4 \end{matrix} ight ] B= [4735] \left [ \begin{matrix} 4 & 7 \ 3 & 5 \end{matrix} ight ] and AB-1 = [1a−35] \left [ \begin{matrix} 1 & a \ -3 & 5 \end{matrix} ight ] then a=?

Accepted Answer

খ. -1

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