Thread: Substitution
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Old April 30th, 2008, 02:53 PM
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Originally Posted by ubhik View Post
Thanks for that, I understand that bit a lot more now!!!

but I need to apply it the following question, but I can't seem to get it right!!!

Ay:=\frac{d^2y}{dx^2} - y

If I try substiting y = x^m
It won't work because the solutions of this equation can't be polynomials.

If you want us to help you, you should tell us what you are asked to do and what is the link between this question and the previous one.
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