MATH 2211 Midterm: Exam3210Sample4

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31 Jan 2019
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An n n matrix a is called skew-symmetric if at = a. Show that if a is skew-symmetric and n is an odd positive integer, then a is not invertible. Solve the linear system using cramer"s rule: x1 + 2x2 + 3x3 = 6. 2x2 + 3x3 = 5 x3 = 1. De ne the linear transformation t : p2 p2 by. T(ax2 + bx + c) = ax2 + (a + b)x + (a + b + c). a. ) Determine whether p(x) = x2 + 2x + 3 is in the range of t. b. ) Find a basis for the range of t. c. ) find a basis for the kernel of t. d. ) verify that the rank theorem holds. For which a s r the set of polynomials {p1, p2, p3} is linearly independent in p2 where p1(x) = a, p2(x) = 2 + (a 4)x, p3(x) = 1 + 2x + (a 1)x2.

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