Question
\text { 5. Consider the matrix } A=\left[\begin{array}{ll} 1 & k \\ 3 & 1 \end{array}\right] \text {. } (a) Find the value of k so that A is singular.
(b) Find the value of k so that A is invertible and A = A-1.
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(b) Find the value of k so that A is invertible and A = A-1.
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