# Math 308 Section 3.3.pdf - 2017-6-6 UW Common Math 308...

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1. 1/1 points | Previous Answers HoltLinAlg1 3.3.003. Use the Quick Formula to find the inverse of the given matrix, if it exists. (If the inverse does not exist, enter DNE into any cell.) 2. 3/3 points | Previous Answers HoltLinAlg1 3.3.009. Use an augmented matrix and row operations to find the inverse of the given matrix, if it exists. (If the inverse does not exist, enter DNE into any cell.) 1 -4 29 0 1 -7 0 0 1 [1, ­4, 29; 0, 1, ­7; 0, 0, 1] 1 4 −1 0 1 7 0 0 1 , 1 4 −1 1 0 0 0 1 7 0 1 0 0 0 1 0 0 1 7 R 3 + R 2 R 2 R 3 + R 1 R 1 ~ 1 4 0 1 0 1 0 1 0 0 1 7 0 0 1 0 0 1 4 R 2 + R 1 R 1 ~ 1 0 0 1 4 29 0 1 0 0 1 7 0 0 1 0 0 1 = . 1 4 −1 0 1 7 −1 1 4 29 0 1 7
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2017-6-6 UW Common Math 308 Section 3.3 3. 3/3 points | Previous Answers HoltLinAlg1 3.3.015. Use an augmented matrix and row operations to find the inverse of the given matrix, if it exists. (If the inverse does not exist, enter DNE into any cell.)
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