T1. The problem statement, all variables and given/known data Solve x*y'' + y' - a*y = 0 where a > 0 2. Relevant equations Not sure whats relevant here. See Below. 3. The attempt at a solution I think this can be solved by changing the independent variable. I tried x = √t, x = 1/t, x = ln(t), x = exp(t) but these seem to make the transformed DE more complicated. I don't think I can use Reduction of Order or Variation of parameters here. I don't have any solution y_1.