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Christos

  • one year ago

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

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  1. AravindG
    • one year ago
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    Yep just use that formula

  2. Christos
    • one year ago
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    Check at my question

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

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

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

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

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

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

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

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

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

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

  13. Christos
    • one year ago
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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)

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

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

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

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

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

  19. Christos
    • one year ago
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    @AravindG

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

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

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

  23. Christos
    • one year ago
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    the red

  24. AravindG
    • one year ago
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    I see 4 options

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

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

  27. AravindG
    • one year ago
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    k

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

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

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