# Linear Algebra with Applications

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• davidvictor
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Name: Tuesday section time: Student ID: Math 20F - Linear Algebra - Winter 2003 Quiz #2 — January 21 (Do not discuss quiz with students who haven’t taken it yet – until 8:00pm.) 1. Let A = 1 2 3 - 1 0 - 1 . (a) What is A T ? ANSWER: A T = 1 - 1 2 0 3 - 1 (b) Compute AA T . ANSWER: AA T = 14 - 4 - 4 2 (c) Does A have an inverse? Explain why or why not. (Watch out for this being a ‘trick’ question!) ANSWER: No, A is not invertible, since A is not square. 2. Let B =
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