having so much trouble with de's in general! i think it's a linear de, but really stuck! please help:

dp/dt = -50 + 15p - p^2

thanks in advance!

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- May 11th 2008, 01:29 AMmathshelpbookcalculus - population model/de
having so much trouble with de's in general! i think it's a linear de, but really stuck! please help:

dp/dt = -50 + 15p - p^2

thanks in advance! - May 11th 2008, 02:03 AMflyingsquirrel
Hello

There is a in the expression so the equation is not linear. However, the two variables and can be separated : and we'll get the solution by integrating the both sides.

To achieve this, one needs to make appear a derivative on the LHS. As the denominator contains a , one can try to transform into which anti-derivative is . Hence solving this problem boils down to finding . Do you have any idea on how this can be done ? - May 11th 2008, 02:26 AMmathshelpbook
thanks flyingsquirrel.

well i have no idea, but i thought maybe i could try 'flipping' it as the rhs is in terms of p

ie. dt/dp = - 1/(p^2 - 15p + 50)

and then t = - integral[1/(p^2 - 15p + 50)] dp

does that work? i'm not sure if that is how to start the question