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Unformatted text preview: for full credit. 2) I gave at least 10 points if you knew the normal equations and substituted into them successfully. Solving the system involves some fractions; the simplest method is probably to compute the inverse of A T A using the adjoint method. A T A x = A T b becomes 9-7-7 11 x 1 x 2 = 5 4 So , x 1 x 2 = 1 50 11 7 7 9 5 4 = 83 / 50 71 / 50 3) Most people chose a) or c); see the text. In a), you should explain why R ( A T ) N ( A ) (see the paragraph above Theorem 5.2.1). I can see how you might think this wasnt part of the proof, so I only took o about 2 points for that. You are always welcome to ask me about such things before or during the quiz. Likewise, part c) was Problem 5.2.13, parts a thru c. Explain why N ( A T A ) = N ( A ). 1...
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- Spring '09