AravindG
find maximum and minimum values for the function g(x)=x^3-3x
Delete
Share
This Question is Closed
AravindG
Best Response
You've already chosen the best response.
0
@hartnn
hartnn
Best Response
You've already chosen the best response.
1
what u got as first derivative ?
AravindG
Best Response
You've already chosen the best response.
0
3x^2-3=0
x^2=1
x=1,-1
AravindG
Best Response
You've already chosen the best response.
0
should i take second derivative?
hartnn
Best Response
You've already chosen the best response.
1
correct.
here u can just put the values in g(x) and by inspection u can tell which is max
hartnn
Best Response
You've already chosen the best response.
1
mathematically, u should take 2nd derivative...
AravindG
Best Response
You've already chosen the best response.
0
max at x=-1 and minimum at x=1
AravindG
Best Response
You've already chosen the best response.
0
bt then why we took second derivative in last qn?
hartnn
Best Response
You've already chosen the best response.
1
because we can't find the max or min just by putting the points and inspection, can we ?
AravindG
Best Response
You've already chosen the best response.
0
i see is my final answers ryt?
AravindG
Best Response
You've already chosen the best response.
0
....
AravindG
Best Response
You've already chosen the best response.
0
u dr??
hartnn
Best Response
You've already chosen the best response.
1
sorry, got disconnected...yes, its correct
AravindG
Best Response
You've already chosen the best response.
0
one last qn and i am done ,,well for this qn i think i gt crct anser bt i want t o knw if i need to take second derivative
"find maximum and minimum value of 3x^4-8x^3+12x^2-48x+25
AravindG
Best Response
You've already chosen the best response.
0
,,,
hartnn
Best Response
You've already chosen the best response.
1
yes, u need to..
AravindG
Best Response
You've already chosen the best response.
0
are answers 0 and 2?
hartnn
Best Response
You've already chosen the best response.
1
mim at x=2
AravindG
Best Response
You've already chosen the best response.
0
max at x=0 min at x=2 ryt?
hartnn
Best Response
You've already chosen the best response.
1
yes, both are correct..i had doubt with max at x=0
AravindG
Best Response
You've already chosen the best response.
0
thanx a lot!!!! it really helped
cant tell u hw thankful i am !!
AravindG
Best Response
You've already chosen the best response.
0
seeya gn8 sweeet drms