# calculus

posted by .

5. If f (x)=(2x+1)^4 then the 4th derivative of f(x)=0 at x = 0 is..

• calculus -

f'=4( )^3 * 2
f"=12 ( )^2 * 2
f'''=24 ( )*2
f""=24*4

So I don't know what your question is, but fourth derivative is not zero.

• calculus -

I think you lost the 2's along the way
f'=4( )^3 * 2
f"=24 ( )^2 * 2
f"'=96 ( )*2
f""=192*2 = 384 (= 24*2^4)

## Similar Questions

1. ### calculus

Find the derivative using the chain rule. f(x) = ((3x-7)/(6x+3))^4 f '(x) = let u= 3x-7 v= (6x+3)^-4 Then d(uv)= u dv + v du du= 3 dv= -4(6x+3)^-5 (6) so what's f'(x)?
2. ### CALCULUS

what is the derivative of ln(x-1)? If you are studying the calculus of logarithms your question surprises me, since that is one of the most basic ones in that topic. in general if y = ln("anything") then y' = 1/"anything" * derivative
3. ### Calculus--> bobpursley

How do you get m=0? from taking the second derivative?
4. ### Calculus - derivatives

Okay, I want to find the derivative of (x^x)^(x^x)... Well, I already went through the process of finding the derivative of just x^x (I used ln to do this). This is what I found... dy/dx = x^x(lnx+1) So now I want to find the derivative …
5. ### Calculus

When f(x)= 2/x (4th power) - 7/x (2nd power) + 5 find the derivative
6. ### Maths Calculus Derivative Integral - Urgent Please

Use 2nd Fundamental Theorem of Calculus to find derivative of f(x) = integral of 2x^2 (at the top) to x-5 (at the bottom) of square root of Sin(x)dx
7. ### calculus

Please help with this. I need the first derivative of f(x)=4(x+squareroot (x(8-x)) and then the second derivative of this to show by the second derivative test that it is a local maximum. This is difficult to put into form here and …
8. ### Calculus

I need to find the second derivative of y=x(x-1)^1/2. I found the first derivative is 2x-1/2(x-1)^1/2, if someone could check, but I am miserably stuck on the second derivative.
9. ### CALCULUS HELP

Find the second derivative for the function 5x^3+60x^2-36x-41 and solve the equation F(X)=0 i got to the second derivative but what do we do next to be able to get one of these answers.. F(x) = 5x3+60x2−36x−41 1. derivative …
10. ### Calculus

1.) Find the derivative of tan (sec x). 2.) Find the derivative if 1/x in four ways, using the limit process, power rule, quotient rule and implicit differentiation. 3.) Show that the derivative of sec^-1 x is 1/(|x|*sqrt(x^2 -1)). …

More Similar Questions