Justify the alternative formula for multiplying a matrix A and a column vector x: Ax = x1C1+x2c2

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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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Applied Linear Algebra

ISBN: 978-0131473829

1st edition

Authors: Peter J. Olver, Cheri Shakiban

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