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0=4x²(x-3)

One step ahead of me...so you will have 2 critical points..
being...?

0 and 3 ?

How do i find that out?

(3, -27)

ok, between them, which one is bigger? the bigger is local max, the smaller is local min. right?

yes

what do you mean which one :S

like between (x,y)

where did -4 and 4 come from ?

plug them into f(x)?

why are we plugging in 3 ?