Math Problem Statement

Evaluate the definite integral \( \int_{-3}^{3} (2 - |x|) dx \) geometrically.

Solution

This problem involves evaluating the definite integral of 33(2x)dx\int_{-3}^{3} (2 - |x|) dx by interpreting it geometrically. Here's the step-by-step explanation:

Step 1: Understand the function 2x2 - |x|

The function 2x2 - |x| represents a "V"-shaped graph because of the absolute value term. Specifically:

  • For x0x \geq 0, x=x|x| = x, so 2x=2x2 - |x| = 2 - x.
  • For x<0x < 0, x=x|x| = -x, so 2x=2+x2 - |x| = 2 + x.

Step 2: Sketch the graph of 2x2 - |x|

The function 2x2 - |x| is a straight line that forms a triangle:

  1. At x=0x = 0, the value is 22.
  2. At x=2x = 2, the value becomes 00 (since 22=02 - |2| = 0).
  3. Similarly, at x=2x = -2, the value becomes 00.

Step 3: Break the integral into parts

The interval [3,3][-3, 3] can be divided into:

  1. From x=3x = -3 to x=2x = -2: The function is negative, but geometric interpretation will simplify this.
  2. From x=2x = -2 to ( final

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Math Problem Analysis

Mathematical Concepts

Definite Integrals
Absolute Value Functions
Geometric Interpretation of Integrals
Graphical Analysis

Formulas

Definite Integral Definition: \( \int_{a}^{b} f(x) dx \)
Absolute Value Function: \( |x| \)

Theorems

Fundamental Theorem of Calculus

Suitable Grade Level

Grades 11-12