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Math diversities

  1. Sep 5, 2014 #1
    I'm interested to find out how many people would agree on several quick solutions:

    10X = 4X

    1) X = 0

    2) 10 = 4 (!?)

    3) 10 = 4 (differentiating !?)

    4) or integrating .... (1?)
     
  2. jcsd
  3. Sep 5, 2014 #2

    phinds

    User Avatar
    Gold Member
    2016 Award

    Huh ???

    I agree that 1) is a solution to 10x = 4x, but as for the rest I have no idea what you are talking about.
     
  4. Sep 5, 2014 #3

    Mark44

    Staff: Mentor

    The only reasonable choice is answer 1.

    The other choices indicate a lack of knowledge in fairly basic mathematics.
    Choice 2 is not reasonable because it results in a contradiction. In this case, dividing by x is dividing by zero.
    Choice 3 is not reasonable because the equation you start with is a conditional equation (i.e., true only for a specific value or values), not one that is identically true.
    Choice 4 is not reasonable for the same reason.
     
    Last edited: Oct 9, 2014
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