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Mathematics 15 Online
OpenStudy (anonymous):

Find d2y/dx2 for 5-2xy=y-x

OpenStudy (adamaero):

well the second derivative of y and x no matter if neg or positive is 0 (so just forget about that part)

OpenStudy (adamaero):

oh, and welcome to Open Study math

OpenStudy (anonymous):

Thanks!

OpenStudy (adamaero):

what answer did you get?

OpenStudy (anonymous):

Idk where to start

OpenStudy (adamaero):

start with the first derivative (dy/dx)

OpenStudy (adamaero):

actually that negative y will be something since you'll have to use implicit differentiation

OpenStudy (anonymous):

So the 5 goes away right?

OpenStudy (adamaero):

yes

OpenStudy (anonymous):

So you're left with -2xy=y-x?

OpenStudy (adamaero):

yes, but put everything in terms of...(I think, let me check...)

OpenStudy (anonymous):

-2xdy/dx=dy/dx-x ?

OpenStudy (anonymous):

No

OpenStudy (adamaero):

I'm asking for you to find your mistake

OpenStudy (anonymous):

I'm not sure what I did wrong

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