anonymous
  • anonymous
differential equations -> xe^-t dx/dt=t with the initial condition that x(0) = 1.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
\[xe ^{-t} \frac{ dx }{ dt }=t\]
anonymous
  • anonymous
\[\int\limits x dx=\int\limits \frac{ t }{ e^{-t}} dt \]
anonymous
  • anonymous
is where im at now, wondering if this is correct

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zepdrix
  • zepdrix
\[\large \int\limits\limits x dx=\int\limits\limits t e^t\; dt\] Yup looks good so far. By Parts on the right side :D
anonymous
  • anonymous
\[\frac{ x^2 }{ 2 }+c=e^t(t-1)\]
anonymous
  • anonymous
right o got that now solving for c hold on
anonymous
  • anonymous
\[\frac{ 1 }{ 2 }+c=e^0(0-1)\] c=\[-\frac{ 3 }{ 2 }\]
zepdrix
  • zepdrix
yay good job c: Pshhhh you didn't need any help with this one lol
anonymous
  • anonymous
so now i have \[\frac{ x^2 }{ 2 }-\frac{ 3 }{ 2 }=e^t(t-1)\]
anonymous
  • anonymous
now the hard part for me is solving for x because the answer wants it in x= soooo what can i do to the 3/2? would that be added to the -1? so the right side would be e^t(t+1/2)?
anonymous
  • anonymous
\[\frac{ x^2 }{ 2 }=e^t(t-1)+\frac{ 3 }{ 2 }\]
zepdrix
  • zepdrix
Multiply both sides by 2\[\large x^2-3=2e^t(t-1)\]Add 3 to both sides,\[\large x^2=2e^t(t-1)+3\]Square root,\[\large x=\pm \sqrt{2e^t(t-1)+3}\]
zepdrix
  • zepdrix
That's probably the route I would take. Get rid of the ugly fraction first :D
anonymous
  • anonymous
ohhhh my that is what i was going to ask next. but multiplying by two is probaly the rout my prof would have taken. Thank you @zepdrix !

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