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- How do i solve this ODE?

When reading through Shankar's Principles of Quantum Mechanics, I came across this ODE

[tex]\psi''-y^2\psi=0[/tex]

solved in the limit where y tends to infinity.

I have tried separating variables and attempted to use an integrating factor to solve this in the general case before taking the limit, but they didn't work.

I also tried to guess a solution of the form [itex]e^{f(y)}[/itex], and it quickly became clear that [tex]f(y)=\frac{y^2}{2}[/tex], but it feels like my guess is unmotivated and i didn't get the [itex]y^m[/itex] term since i didn't guess it would be there.

Is there any general method for this kind of ODE?

[tex]\psi''-y^2\psi=0[/tex]

solved in the limit where y tends to infinity.

I have tried separating variables and attempted to use an integrating factor to solve this in the general case before taking the limit, but they didn't work.

I also tried to guess a solution of the form [itex]e^{f(y)}[/itex], and it quickly became clear that [tex]f(y)=\frac{y^2}{2}[/tex], but it feels like my guess is unmotivated and i didn't get the [itex]y^m[/itex] term since i didn't guess it would be there.

Is there any general method for this kind of ODE?