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anonymous

  • 4 years ago

Find the slope of the tangent using f(x+h) - f(x) / h y = 8 /x where x = 2

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  1. bahrom7893
    • 4 years ago
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    y = 8/x, find the derivative using the limit definition..

  2. bahrom7893
    • 4 years ago
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    all of this will be lim as x->0 (f(x+h)-f(x))/h = (2/(x+h) - 8/x)/h

  3. anonymous
    • 4 years ago
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    yea i did..but i got 0 on the nominator

  4. anonymous
    • 4 years ago
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    isnt it 8 / x + h - ( 8/x) / h?

  5. bahrom7893
    • 4 years ago
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    |dw:1328674694351:dw|

  6. bahrom7893
    • 4 years ago
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    oh yea.. sorry it is

  7. bahrom7893
    • 4 years ago
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    I was about to say something's wrong..

  8. anonymous
    • 4 years ago
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    yea..and when i group them together, i get a total of 0..

  9. bahrom7893
    • 4 years ago
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    |dw:1328674796938:dw|

  10. bahrom7893
    • 4 years ago
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    -8/(x*(x+h)), hmm u're right

  11. anonymous
    • 4 years ago
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    yea, but the answer given is -2..

  12. bahrom7893
    • 4 years ago
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    trying on paper..

  13. anonymous
    • 4 years ago
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    well the question actually gives (2,4) , so does the y help?

  14. bahrom7893
    • 4 years ago
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    something's wrong with the question... i'm getting the same thing over and over again

  15. bahrom7893
    • 4 years ago
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    well let's try that..

  16. anonymous
    • 4 years ago
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    ok thanks!

  17. bahrom7893
    • 4 years ago
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    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

  18. anonymous
    • 4 years ago
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    ohh i will ask my teacher about it then, can u help me to look at one more question if u can?

  19. bahrom7893
    • 4 years ago
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    yea sure

  20. anonymous
    • 4 years ago
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    y = sqrt x- 2 , giving (3, 1)

  21. bahrom7893
    • 4 years ago
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    is sqrt just over x or over x-2?

  22. anonymous
    • 4 years ago
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    guys, h is approaching 0, not x in the difference quotient.

  23. bahrom7893
    • 4 years ago
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    OHHHHHHHHHH snap, i feel dumb.. thanks rick

  24. anonymous
    • 4 years ago
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    np ;)

  25. bahrom7893
    • 4 years ago
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    |dw:1328675271185:dw|

  26. bahrom7893
    • 4 years ago
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    |dw:1328675283240:dw|

  27. anonymous
    • 4 years ago
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    OHHHH wait , give me some time to understand lol

  28. anonymous
    • 4 years ago
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    oh i get it now thanks!! and for the 2nd one, the sqrt is over x-2

  29. bahrom7893
    • 4 years ago
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    hold on... helpin someone

  30. anonymous
    • 4 years ago
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    ok, and i actually give the wrong question it is y = sqrt (5x- 1) at x =2 i will wait :)

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