A model for the population of a city is given by:

$\displaystyle \frac{dp}{dt} = -4*10^{-8}p^2 + 0,56p -16*10^5$

$\displaystyle p(0) = 6*10^6$

And then I should find an expression for the population, p(t) (after t years). But how do I begin? The right side can also be written like: $\displaystyle -4*10^{-8}(p-10^7)(p-4*10^6)$