Area functions Let A(x) be the area of the region bounded by the t -axis and the graph of y=ƒ(t) from t=0 to t=x. Consider the following functions and graphs.


c. Find a formula for A(x)


ƒ(t) =6 <IMAGE>

Key Concepts

Definite Integral

The definite integral of a function over an interval gives the net area under the curve of that function between two points. In this context, to find the area function A(x), we use the definite integral of the function f(t) from 0 to x, which mathematically is expressed as A(x) = ∫[0 to x] f(t) dt. This concept is fundamental in calculus as it connects the geometric interpretation of area with the analytical process of integration.

Area Under a Curve

The area under a curve represents the total space between the curve and the x-axis over a specified interval. For the function f(t), the area A(x) from t=0 to t=x quantifies how much space is enclosed by the graph of f(t) and the t-axis. Understanding this concept is crucial for solving problems related to area functions, as it directly relates to the application of integration.

Function Notation

Function notation, such as A(x) or f(t), is a way to represent mathematical functions and their outputs. In this case, A(x) denotes the area as a function of x, while f(t) represents the function whose area we are calculating. Grasping function notation is essential for interpreting and manipulating mathematical expressions correctly, especially in calculus where functions are frequently analyzed and transformed.