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For the following equation, evaluate 
f^(')(3).

f(x)=-x^(3)-4x
Answer:

For the following equation, evaluate f(3) f^{\prime}(3) .\newlinef(x)=x34x f(x)=-x^{3}-4 x \newlineAnswer:

Full solution

Q. For the following equation, evaluate f(3) f^{\prime}(3) .\newlinef(x)=x34x f(x)=-x^{3}-4 x \newlineAnswer:
  1. Identify Function and Point: Identify the function and the point at which the derivative is to be evaluated.\newlineWe are given the function f(x)=x34xf(x) = -x^3 - 4x and we need to find the derivative of this function at x=3x = 3.
  2. Calculate Derivative of Function: Calculate the derivative of the function f(x)f(x). To find f(x)f'(x), we need to differentiate f(x)f(x) with respect to xx. f(x)=ddx(x34x)f'(x) = \frac{d}{dx} (-x^3 - 4x) Using the power rule, the derivative of x3-x^3 is 3x2-3x^2, and the derivative of 4x-4x is 4-4. So, f(x)=3x24f'(x) = -3x^2 - 4
  3. Evaluate Derivative at x=3x=3: Evaluate the derivative at x=3x = 3. Substitute x=3x = 3 into the derivative f(x)f'(x) to find f(3)f'(3). f(3)=3(3)24f'(3) = -3(3)^2 - 4 f(3)=3(9)4f'(3) = -3(9) - 4 f(3)=274f'(3) = -27 - 4 f(3)=31f'(3) = -31

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