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Panphobia

Fri May 24, 2013 1:47 pm


Difficult calculus problem

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Dont tell me that this question isn't hard because, I have not learned differential equations yet so I do not know what to do. [code]If: f''(x) + f'(x) - 2f(x) = 4x - 4
F''(x) != 0
Find f(x)[/code]


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Dreadnought

Fri May 24, 2013 7:46 pm


Re: Difficult calculus problem

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Ignore the condition of f'' not 0, can you solve that?

Then consider g(x) = exp(x), what is g''(x) + g'(x) - 2g(x).

EDIT: It's not necessarily that the question is really hard, but rather tricky, once you see the trick it's not so bad.