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calculus help

Wheatmaster

Diamond Member
Aug 10, 2002
3,882
0
0
argh i'm studying for finals and i totally forgot how to do limits.

lim x-> infinity
(5-x^2)/2x^2

i thought you just plug in infinity but that doesn't seem to work. i can't factor anything... :(
 

gnuel3

Senior member
Oct 19, 2002
506
0
0
i thik you split it like 5/2x^2 - x^2/2x^2, then you get the limit as -1/2...
 

TuxDave

Lifer
Oct 8, 2002
10,572
3
71
Originally posted by: gnuel3
i thik you split it like 5/2x^2 - x^2/2x^2, then you get the limit as -1/2...
ding ding ding.... I would've probably just multiplied the top and bottom by 1/x^2 but I guess it works out the same.
 

Siva

Diamond Member
Mar 8, 2001
5,472
0
71
It amazes me that I got a 5 on the AP test... I don't remember a single bit of this stuff.
 

SpecialEd

Platinum Member
Jul 18, 2001
2,110
0
0
you could also use L'hospital's rule:

if you plug in infty and get infty/infty, just take the derivative of the top and bottom and the limits are equal.
 

cw42

Diamond Member
Jan 15, 2004
4,227
0
76
o crap, i just did this stuff last semester... i dont remember any calc
 

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