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



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bmelyk
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\[3 x (\frac{ 4x^33 }{ (3x^43x+5)^4 }\]

bmelyk
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that's not a 3x, it's 3 times the fraction.

hartnn
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why is there 3x multiplied ?

hartnn
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then you are correct!

bmelyk
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yay~~~ :)

uzumakhi
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there should be 12 x^3 in place of 4x^3

bmelyk
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why?

bmelyk
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it should be 12x^2 shouldnt it?

uzumakhi
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can you write correct answer for us

bmelyk
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12x^3, i see why.

hartnn
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3*(4x3) will give 12x^3 +9
@uzumakhi

bmelyk
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i didn't do out the derivative, i get it.

bmelyk
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so i was right to begin with?

bmelyk
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now im confused.. was my answer okay in the first place?

uzumakhi
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\[3(\frac{ 12x ^{3}3 }{ (3x ^{4}3x + 5)^{4} })\]

uzumakhi
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recheck your answer with my answer then you find your mistakes

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

bmelyk
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no i have the same now because when you take the derivative of 3x^43x+5 it is 12x^33,
i forgot to place my power rule on my 3x^4

uzumakhi
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that i want to tell in begining

bmelyk
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i gotcha!

uzumakhi
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ok your wlcome