anonymous
  • anonymous
need help to solve this equation e^tdy/dt=y^3
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
e^tdy/dt=y^3 dyv^-3=dt e^-t on integratiion y^-2/2=e^-t/-1 +constant
anonymous
  • anonymous
than you very much
anonymous
  • anonymous
ur welcome

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anonymous
  • anonymous
if i need the general solution of the differential equation expressing y explicitly as a function of t and hence find the particular solution that satisfies the initial y(0)=1 do i need to make it y=f(x) then find the constant c then substitute the value of x through f(x) thanks
anonymous
  • anonymous
is it right
anonymous
  • anonymous
Have you written the question correctly? A first order non-linear differential equation? (non-linear?) Wolfram gives: http://www.wolframalpha.com/input/?i=e^t+dy%2Fdt%3Dy^3 A wacky solution... it seems to be interpreting it correctly, as least how I would think of it from what you've written...
anonymous
  • anonymous
yes its true e^t *dy/dt=y^3 (where y is gretethan 0) but i use the wolframalpha but itesnt go right whatdo you thinease
anonymous
  • anonymous
sorry what do you think please
anonymous
  • anonymous
http://www.wolframalpha.com/ Type into the search the problem: e^t *dy/dt=y^3 It will solve it. But it's not a nice looking solution...
anonymous
  • anonymous
the answer i got is y=1/-2e^t+2c
anonymous
  • anonymous
and this without computr
anonymous
  • anonymous
actually the solution the other guy gave is right. But it's written implicitly not explicity, which is why it looks different to what wolfram gives. But still the solution is very ugly. If this is for a class assignment then I think this is either written incorrectly, or it's supposed to look ugly for some reason (maybe it's from a real life problem).
anonymous
  • anonymous
ok thanks lot will try it again
anonymous
  • anonymous
here's the solution that the other guy gave: -1/2 * y^(-2) = -e^(-t) + C. I think that's right. But see how that's written in implicit form. If you solve that for y then I think you should end up with what wolfram alpha got.

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