Tuesday

September 16, 2014

September 16, 2014

Posted by **Hannah** on Saturday, February 5, 2011 at 11:31am.

i thought that the derivative would be 2 x^1/2 but I guess this is wrong.

- Math -
**helper**, Saturday, February 5, 2011 at 1:09pmdy/dx 2x^(1/2)

2 * 1/2 x^(1/2 - 2/2)

2/2 x^(-1/2) = x^(-1/2) = 1/(sqrt(x))

- Math -
**dave**, Saturday, February 5, 2011 at 1:17pmYou have two problems here.

1. need D:f(x) = 2sqrtx

2. subsitute x=4 into derivative

D: 2sqrtx :

a) multiply power times coefficient; 1/2 * 2 = 1

b)power - 1 = 1/2 -1 = -1/2

c. f'(x) = x^-1/2 or 1/sqrtx

substitute 4 for x and you should be there

**Answer this Question**

**Related Questions**

Calculus (Help) - Also I would like to know how to set this problem up in ...

Calc I - Find the range of y = (3x-1)/(2x^2 + x - 6) I was going to take the ...

Calc - a) y =ln(x-1) find dy/dx=? b) y=3 ln x - ln (1/x) where x >0, dy/dx...

math - Find the derivative of y=3x-2(4^x) Here is my attempt: Derivative of 3x ...

Calculus - find derivitive of 1/square root of x 1/square root of x = x^(-1/2) ...

calculus - find the derivative of f(x)=x^2sec^2(3x) also with g(x)=sqrt(cosxsecx...

calc - find the derivative of y = sqrt(9 - 16x) Use the chain rule. First find ...

math/derivatives - Please compute the derivative for g(x)= sqrt x - 3/x squared...

Calculus - Find the derivative of cos(sqrt(e^(x^3)cos(x)) I got -sin(sqrt(e^(x^3...

calculus - Find the derivative of the function using the definition of ...