A First Course in Linear Algebra · Problem MISLE.C17

Matrices — Robert Beezer

Mathematics — Linear Algebra · matrix-inverse-computation

Problem

If it exists, find the inverse of

A = \begin{bmatrix} 2 & -1 & 1 \\ 1 & 2 & 1 \\ 3 & 1 & 2 \end{bmatrix}

, and check your answer.