- #1

myusernameis

- 56

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## Homework Statement

It's a modeling question, the question itself doesn't matter because i know how to do, but stuck on one of the equations

## Homework Equations

Q'(t)=15- 3Q(x)/800, Q(0)=2,

## The Attempt at a Solution

I'm stuck at e^(3t/800) *Q(t) = 9/109 *e^(3t/800) +c

but the answer's supposed to be

Q(t)=4000-3998e^(-3t/800)..

how? why??/

thanks