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y = 8/x, find the derivative using the limit definition..
all of this will be lim as x->0 (f(x+h)-f(x))/h = (2/(x+h) - 8/x)/h
yea i did..but i got 0 on the nominator
isnt it 8 / x + h - ( 8/x) / h?
oh yea.. sorry it is
I was about to say something's wrong..
yea..and when i group them together, i get a total of 0..
-8/(x*(x+h)), hmm u're right
yea, but the answer given is -2..
trying on paper..
well the question actually gives (2,4) , so does the y help?
something's wrong with the question... i'm getting the same thing over and over again
well let's try that..
still doesn't work out.. the thing is that's the problem with the graphs when x is on the bottom.. even if i differentiate it and get 8lnx, i won't be able to find slope for negative x... and i have a feelin the limit is pullin us in that direction
ohh i will ask my teacher about it then, can u help me to look at one more question if u can?
y = sqrt x- 2 , giving (3, 1)
is sqrt just over x or over x-2?
guys, h is approaching 0, not x in the difference quotient.
OHHHHHHHHHH snap, i feel dumb.. thanks rick
OHHHH wait , give me some time to understand lol
oh i get it now thanks!! and for the 2nd one, the sqrt is over x-2
hold on... helpin someone
ok, and i actually give the wrong question it is y = sqrt (5x- 1) at x =2 i will wait :)