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 | Vectors are easier to understand when they're described in terms of orthogonal bases. In addition, the Four Fundamental Subspaces are orthogonal to each other in pairs. If A is a rectangular matrix, Ax = b is often unsolvable. The matrix ATA will help us find a vector x̂ that comes as close as possible to solving Ax = b. |
Work the problems on your own and check your answers when you're done.
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