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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §11.4 Matrices and Linear Equations, #28 · Linear Algebra · Linear systems

Show that the determinant of … is …:

Show that the determinant of $A^{- 1}$ is $1/ det A$ :
$A^{- 1} = [d / (a d - b c) - c / (a d - b c) - b / (a d - b c) a / (a d - b c)]$

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §11.4 Matrices and Linear Equations, #28

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