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Christos Group Title

Derivatives, There is this problem that asks me to find the derivative of f(x)=2x^2 ONLY by making use of this formula: f'(x)=lim(h-->0)(f(x+h)-f(x))/h My Question is this: http://screencast.com/t/fdJEOQduGCj

  • one year ago
  • one year ago

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  1. AravindG Group Title
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    Yep just use that formula

    • one year ago
  2. Christos Group Title
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    Check at my question

    • one year ago
  3. AravindG Group Title
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    f(x+h)=? f(x)=?

    • one year ago
  4. AravindG Group Title
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    Can you write those?

    • one year ago
  5. julian25 Group Title
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    ?????? it is right?????? the derivative is 4x

    • one year ago
  6. Christos Group Title
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    f(x)= 2x^2 f(x=h)= 2(x+h)^2

    • one year ago
  7. AravindG Group Title
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    *f(x+h)

    • one year ago
  8. AravindG Group Title
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    f(x+h)= 2x^2 f(x=h)= 2(x+h)^2

    • one year ago
  9. Christos Group Title
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    But my approach (the one with the red letters) gives 0. And I didn't do any mistake

    • one year ago
  10. Christos Group Title
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    thats what I said @AravindG

    • one year ago
  11. Christos Group Title
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    ah yea +**

    • one year ago
  12. AravindG Group Title
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    What is your problem ? You are getting correct answer 4x ?

    • one year ago
  13. Christos Group Title
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    No, look. The black letters is the solution manual. On the other hand the RED letters are my approach. The solution gives 4x. My solution gives 0. Both solutions doesn't have any mathematical mistake. ( and it's driving me crazy)

    • one year ago
  14. AravindG Group Title
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    Why 0 ? You are told x=0 ?

    • one year ago
  15. Christos Group Title
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    lim (h--->0)

    • one year ago
  16. AravindG Group Title
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    that will be 0+4x .I dont see 0 anywhere

    • one year ago
  17. AravindG Group Title
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    0+4x=4x

    • one year ago
  18. Christos Group Title
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    Do you see this http://screencast.com/t/YqaRwsAr5b

    • one year ago
  19. Christos Group Title
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    @AravindG

    • one year ago
  20. AravindG Group Title
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    so option 1 will be correct

    • one year ago
  21. Christos Group Title
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    buth both options doesn't have any mathematical mistakes. Agree?

    • one year ago
  22. AravindG Group Title
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    tell me which options you are speaking of

    • one year ago
  23. Christos Group Title
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    the red

    • one year ago
  24. AravindG Group Title
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    I see 4 options

    • one year ago
  25. AravindG Group Title
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    Which do you mean by saying both ?

    • one year ago
  26. Christos Group Title
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    Wait. Let me write the whole thing here on Open Study , 1 sec

    • one year ago
  27. AravindG Group Title
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    k

    • one year ago
  28. Christos Group Title
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    Forget it I got my mistake, jeez and phew

    • one year ago
  29. AravindG Group Title
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    lol Great you figured it out yourself :)

    • one year ago
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