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    IBHardAlgebra10–12

    For A=(3152)A = \begin{pmatrix} 3 & 1 \\ 5 & 2 \end{pmatrix}, what is the entry in row 11, column 22 of A−1A^{-1}?

    Para A=(3152)A = \begin{pmatrix} 3 & 1 \\ 5 & 2 \end{pmatrix}, qual é o elemento da linha 11, coluna 22 de A−1A^{-1}?

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    Solution

    Step 1 of 3

    1. 1.det⁡A=3×2−1×5=1\det A = 3 \times 2 - 1 \times 5 = 1