Question

i need help finding the first derivative of this problem

Ln(3x^4+5)

Answer 1

You need to use the chain rule here.

Let
g(x) = ln( 3x^4 + 5 ) = ln( f(x) )
where
f(x) = 3x^4 + 5

Then...

Answer 2

hold on before you continue that should have been 5x not just 5 sorry

Answer 3

\[ \frac{dg}{dx} = \frac{dg}{df}\frac{df}{dx} \]

See what to do now?

Answer 4

Ok f(x) = 3x^4 + 5x

Answer 5

right thats what I've been using and i keep coming up this (12x^3+5)/(3x^4+5) which is not the correct answer..

Answer 6

No but,

(12x^3+5)/(3x^4+5x)

is

Answer 7

...putting the 5x in the denominator, vs. 5

Answer 8

OMG me forgetting that x is a serious problem lol thanks a ton!