Need help! A Maths Differentiation question!!!!

hey guys? can y'all help me out please? :( I've been struggling to finish this!!!

http://imgur.com/DtpHj.jpg

thanks!

y = 3/(x² + 2)² = 3(x² + 2)^-2

dy/dx
= -6(x² + 2)^-3 * 2x
= -12x/(x² + 2)³

Very hard meh?

y = 3.... oh, there you go.

chain rule... learnt it only 3 weeks back