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what u got as first derivative ?

3x^2-3=0
x^2=1
x=1,-1

should i take second derivative?

correct.
here u can just put the values in g(x) and by inspection u can tell which is max

mathematically, u should take 2nd derivative...

max at x=-1 and minimum at x=1

bt then why we took second derivative in last qn?

because we can't find the max or min just by putting the points and inspection, can we ?

i see is my final answers ryt?

....

u dr??

sorry, got disconnected...yes, its correct

,,,

yes, u need to..

are answers 0 and 2?

mim at x=2

max at x=0 min at x=2 ryt?

yes, both are correct..i had doubt with max at x=0

thanx a lot!!!! it really helped
cant tell u hw thankful i am !!

seeya gn8 sweeet drms