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If A is an m x n matrix, with columns a1, a2, ..., an, and if x is in R^n, then the product of A an dx , denoted by Ax, is what?

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1. If A is an m x n matrix, with columns a1, a2, ..., an, and if x is in R^n, then the product of A an dx , denoted by Ax, is what?





 
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