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Is there a typo in x_1 for the particular solution in this answer?

  1. Mar 25, 2017 #1

    s3a

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    1. The problem statement, all variables and given/known data
    In question #1(b)'s answer, should x_1 = 4 (instead of -4)?

    2. Relevant equations
    PDF of problem #1(b):
    https://www.dawsoncollege.qc.ca/pub...ms/201-nyc-05-computer_science-winter2011.pdf

    Reduced row echelon form of the matrix I obtained from the given equations (in problem #1):
    http://www.wolframalpha.com/input/?...ix+{{1,2,-2,3,2},{2,5,-3,4,5},{5,9,-8,11,12}}

    3. The attempt at a solution
    If t = 0, then it should be the case that x_3 = 1 + 2*0 = 0, x_2 = 0 and that x_1 = 4 + 0 = 4 ≠ -4.

    Am I right and the answer is wrong?
     
  2. jcsd
  3. Mar 25, 2017 #2

    SammyS

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    Staff Emeritus
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    Yes.
    That is surely a typo.

    If t=0, then x1 = 4 .
     
  4. Mar 26, 2017 #3

    s3a

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    Great, so it's not just me. Thanks. :)
     
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