isn't this related to that thread you posted on ODE's? if you have problems with what was done in that thread, or were not sure on how to proceed in that thread then you should have made that known in THAT thread

for use a substitution,

for expand and use the power rule

(and you need to wrap math tags around your LaTeX code to get it to work, that is, you must type [tex]\frac {dy}{(y + 3)^2} = (x - 1)^2~dx[/tex] to get