Third order DE! (y'''=3*y*y')

I'm interested in solving this 3rd order DE y'''=3*y*y' with conds y(0)=-2, y'(0)=0, y''(0)=4,5. Thanks for any ideas.. I've the right solution, but the problem is how to achieve it.
 
try
[tex]\frac{3}{2}\frac{d}{dt}(y^2)=3y\dot{y}[/tex]
 

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