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Linearazationish Problem

  1. Oct 13, 2013 #1
    1. The problem statement, all variables and given/known data
    If z=x^2-xy+3y^2 and (x,y) changes from (3,-1) to (2.96,-.95) compare the values of Δz and dz.



    3. The attempt at a solution
    So I plugged the two given sets of (x,y) into and solved for z and subtracted one from the other and got |.7189|. I don't know what the question means when it says compare it to dz. Since z is a function of two variables how do I do this? To I take the partial with regards to each variable or whaaat? does anyone know what the question is asking?
     
  2. jcsd
  3. Oct 13, 2013 #2

    UltrafastPED

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  4. Oct 14, 2013 #3
    so I took the function partial of x and added it to the partial of y. it wants me to compare delta_z with dz. Which numbers should I plug in for dz? The initial values or final?
     
  5. Oct 14, 2013 #4

    UltrafastPED

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    Try the difference of both!
     
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