Area functions for constant functions Consider the following functions ƒ and real numbers a (see figure).
(b) Verify that .A'(𝓍) = ƒ(𝓍)

ƒ(t) = 5 , a = -5

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Step 1: Understand the problem. The function ƒ(t) = 5 is a constant function, and the area function A(x) represents the area under the curve of ƒ(t) from t = a to t = x. We are tasked with verifying that the derivative of A(x), denoted A'(x), equals ƒ(x).

Step 2: Recall the definition of the area function. A(x) is defined as the integral of ƒ(t) from t = a to t = x: A(x) = ∫[a, x] ƒ(t) dt. Substituting ƒ(t) = 5, we have A(x) = ∫[a, x] 5 dt.

Step 3: Compute the integral. The integral of a constant function c over an interval [a, x] is given by c * (x - a). Therefore, A(x) = 5 * (x - a).

Step 4: Differentiate A(x) with respect to x. Using the derivative rules, differentiate A(x) = 5 * (x - a). Since a is a constant, its derivative is 0, and the derivative of x is 1. Thus, A'(x) = 5.

Step 5: Verify the result. The derivative A'(x) = 5 matches the original function ƒ(x) = 5, confirming that A'(x) = ƒ(x). This verifies the relationship between the area function and the original function.

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주요 개념

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Area Function

An area function, denoted as A(x), represents the area under a curve from a fixed point a to a variable point x on the x-axis. In this context, if f(t) is a constant function, the area A(x) can be calculated as the product of the height f(t) and the width (x - a). This concept is fundamental in understanding how the area changes as x varies.

Fundamental Theorem of Calculus

The Fundamental Theorem of Calculus links the concept of differentiation and integration, stating that if A(x) is the area function defined as the integral of f(t) from a to x, then the derivative A'(x) equals f(x). This theorem is crucial for verifying relationships between area functions and their corresponding functions, particularly in the context of constant functions.

Constant Functions

A constant function is a function that always returns the same value, regardless of the input. In this case, f(t) = 5 is a constant function, meaning the height of the rectangle representing the area under the curve remains unchanged as x varies. Understanding constant functions is essential for analyzing the area function and its derivative, as it simplifies the calculations involved.

Area functions for constant functions Consider the following functions ƒ and real numbers a (see figure).(b) Verify that .A'(𝓍) = ƒ(𝓍) ƒ(t) = 5 , a = -5