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Unformatted text preview: b ? Continuing the example, do the columns of A span R 3 ? EXAMPLE. Suppose A is a 4 3 matrix and b is a vector in R 4 with the property that A x = b has a unique solution. What can you say about the reduced echelon form of A ? NOTE. If the product A x is dened, then the i th entry of the product is the sum of the products of the corresponding entries from the i th row of A and from the vector x . Lets practice. 1 3-2 5 2-3-9 6 5 3-1 HOMEWORK: SECTION 1.4...
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