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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §11.4 Matrices and Linear Equations, #29 · Linear Algebra · Linear systems

Compute … and … and also … and …:

Compute $A B$ and $B A$ and also $B C$ and $C B$ :
$A = [12 4 - 1] B = [3111] C = [1012]$ .
Verify the associative law: $A B$ times $C$ equals $A$ times $B C$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §11.4 Matrices and Linear Equations, #29

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