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bmelyk

  • 3 years ago

Just want an answer checked: Find the derivative of the function given below. y = (3x4 – 3x + 5)^-3

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  1. bmelyk
    • 3 years ago
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    \[-3 x (\frac{ 4x^3-3 }{ (3x^4-3x+5)^-4 }\]

  2. bmelyk
    • 3 years ago
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    that's not a -3x, it's -3 times the fraction.

  3. hartnn
    • 3 years ago
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    why is there 3x multiplied ?

  4. hartnn
    • 3 years ago
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    then you are correct!

  5. bmelyk
    • 3 years ago
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    yay~~~ :)

  6. uzumakhi
    • 3 years ago
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    there should be 12 x^3 in place of 4x^3

  7. bmelyk
    • 3 years ago
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    why?

  8. bmelyk
    • 3 years ago
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    it should be 12x^2 shouldnt it?

  9. uzumakhi
    • 3 years ago
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    can you write correct answer for us

  10. bmelyk
    • 3 years ago
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    12x^3, i see why.

  11. hartnn
    • 3 years ago
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    -3*(4x-3) will give -12x^3 +9 @uzumakhi

  12. bmelyk
    • 3 years ago
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    i didn't do out the derivative, i get it.

  13. bmelyk
    • 3 years ago
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    so i was right to begin with?

  14. bmelyk
    • 3 years ago
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    now im confused.. was my answer okay in the first place?

  15. uzumakhi
    • 3 years ago
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    \[-3(\frac{ 12x ^{3}-3 }{ (3x ^{4}-3x + 5)^{4} })\]

  16. uzumakhi
    • 3 years ago
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    recheck your answer with my answer then you find your mistakes

  17. hartnn
    • 3 years ago
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    oh , yes.....sorry! u missed the 3 @uzumakhi is correct. sorry for confusion :(

  18. bmelyk
    • 3 years ago
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    no i have the same now because when you take the derivative of 3x^4-3x+5 it is 12x^3-3, i forgot to place my power rule on my 3x^4

  19. uzumakhi
    • 3 years ago
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    that i want to tell in begining

  20. bmelyk
    • 3 years ago
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    i gotcha!

  21. uzumakhi
    • 3 years ago
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    ok your wlcome

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