Q. For the following equation, evaluate f′(3).f(x)=−x3−4xAnswer:
Identify Function and Point: Identify the function and the point at which the derivative is to be evaluated.We are given the function f(x)=−x3−4x and we need to find the derivative of this function at x=3.
Calculate Derivative of Function: Calculate the derivative of the function f(x). To find f′(x), we need to differentiate f(x) with respect to x. f′(x)=dxd(−x3−4x) Using the power rule, the derivative of −x3 is −3x2, and the derivative of −4x is −4. So, f′(x)=−3x2−4
Evaluate Derivative at x=3: Evaluate the derivative at x=3. Substitute x=3 into the derivative f′(x) to find f′(3). f′(3)=−3(3)2−4f′(3)=−3(9)−4f′(3)=−27−4f′(3)=−31
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