Advanced Math/Matrix

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Expert: Sherry Wallin - 7/30/2011


Question
If Matrix A =   1    0    1   then show that |3A| = 27 |A|
          0    1    2
               0    0    4

Answer
   det 3A = |3   0    3| = 3|3     6| = 3(3(12) - 0(6)) = 3(36) = 108
                    |0   3    6|       |0   12|
                    |0   0  12|


  27*det A = 27|A| = 27 |1   0   1| = 27(1(4)-0(2)) = 27(4) = 108
                                            |0   1   2|  
                                            |0   0   4|

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Sherry Wallin

Expertise

I can answer most questions up through Calculus and some in Number Theory and Abstract Algebra.

Experience

I have had my Bachelor's Degree since 1987 and have been a teacher since 1988. I earned my Masters Degree in Mathematics May 2010. I have been teaching at the same community college since 2002.

Education/Credentials
I have taught 12 years at the community college level, medical college, and technical college as well as a high school instructor and alternative education instructor and charter school instructor.

Awards and Honors
Master's GPA 3.56 Bachelor's GPA 3.34 Post grad work not degree related GPA 4.0

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