MATH136 Study Guide - Midterm Guide: Elementary Matrix, Row Echelon Form, Augmented Matrix
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8 Mar 2016
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MATH136 Full Course Notes
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Note: - only answers are provided here (and some proofs). On the test you must provide full and complete solutions to receive full marks: short answer problems, list the 3 elementary row operations. Soln: this is a plane with vector equation ~x = t . , s, t r: state the de nition of the rank of a matrix. Soln: the number of leading ones in the rref of the matrix: explain why ~a (~b ~c) must be a vector in the plane with vector equation. ~x = s~b + t~c, s, t r. Soln: suppose that ~n = ~b ~c 6= ~0. Then ~n is orthogonal to both ~b and ~c, so it is a normal vector to the plane through the origin that contain ~b and ~c. Then ~a (~b ~c) = ~a ~n is orthogonal to ~n so it lies in the plane with normal ~n, that is, in the plane containing ~b and.
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