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Homework Help: Basic Differential Equation Can you check my work?

  1. Sep 6, 2010 #1
    1. The problem statement, all variables and given/known data
    state the order and linearity of the diff eq[/SIZE]

    (d^2u/dr^2)+(du/dr)+(u)=cos(r+u)

    1)the order is the second order. since the highest derivative is 2
    2) the term cos(r+u) is not linear therefore this equation is not linear.

    is my reasoning for 2) right since the dependent variable is contain in cos(r+u) that makes this non-linear, right?
     
  2. jcsd
  3. Sep 6, 2010 #2

    hunt_mat

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    Homework Helper

    Looks good to me.
     
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