Multiplying a matrix by a column vector | Matrices | Precalculus | Khan Academy

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Precalculus on Khan Academy: You may think that precalculus is simply the course you take before calculus. You would be right, of course, but that definition doesn't mean anything unless you have some knowledge of what calculus is. Let's keep it simple, shall we? Calculus is a conceptual framework which provides systematic techniques for solving problems. These problems are appropriately applicable to analytic geometry and algebra. Therefore....precalculus gives you the background for the mathematical concepts, problems, issues and techniques that appear in calculus, including trigonometry, functions, complex numbers, vectors, matrices, and others. There you have it ladies and gentlemen....an introduction to precalculus!

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"What is Aw?" me after seeing my math grades

mythics
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What is the w vector is only variables like x1, x2 and x3?

oLars
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what was the use of the last entry in w then?

cocoa
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Why do we traditionally multiply in the order Aw rather than wA?

AkamiChannel
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Sorry to say this, but I want its real meaning not just a process to solve, Please tell me what is the real meaning of multiplying a matrix with a vector?

prabhav_gautam
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is he mixing up columns with rows or is it only me who noticed this?

basmashalaby