Question: Justify the alternative formula for multiplying a matrix A and a column vector x: Ax = x1C1+x2c2 + + xncn. (1.13) where

Justify the alternative formula for multiplying a matrix A and a column vector x:
Ax = x1C1+x2c2 + ∙ ∙ ∙ + xncn. (1.13)
where c1,... ,cn are the columns of A and. x1,... ,xn the entries of x.

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