Instantaneous Rate of Change and Average Rate of Change I'm currently studying for my calculus AP exam and I'm currently stuck on a question. Unless otherwise specified, the domain of a function f is assumed to be the set of all real numbers x for which f(x) is a real number. The table above gives values of a twice-differentiable function f and its first derivative f′ for selected values of x. Let g be the function defined by g(x)=f(x^2−x).

Neveah Salazar

Neveah Salazar

Open question

2022-08-22

Instantaneous Rate of Change and Average Rate of Change
I'm currently studying for my calculus AP exam and I'm currently stuck on a question.
Unless otherwise specified, the domain of a function f is assumed to be the set of all real numbers x for which f(x) is a real number.
x 3 0 3 6 f ( x ) 5 4 1 7 f ( x ) 1 2 2 4
The table above gives values of a twice-differentiable function f and its first derivative f for selected values of x. Let g be the function defined by g ( x ) = f ( x 2 x ).
Let h be the function with derivative given by h ( x ) = 4 e cos x . At what value of x in the interval 3 x 0 does the instantaneous rate of change of h equal the average rate of change f over the interval 3 x 0?
I don't need someone to spoonfeed me the answer, but if someone would be able to tell me what theorem or what the first step or two I need to take to get started would be great. Thanks!

Answer & Explanation

Adrienne Sherman

Adrienne Sherman

Beginner2022-08-23Added 9 answers

The average rate of change is the slope of the line connecting the two endpoints at ( 3 , f ( 3 ) ) and ( 0 , f ( 0 ) )
It is givn by
f ( 0 ) f ( 3 ) 0 ( 3 )
The instantaneous rate of change is the derivative 4 e cos x
Now you must find the x such that the instanteous rate of change of h ( x ) equals the average change of f ( x ) over the interval. Hopefully there is such an x!

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