Math Problem Statement

Use integration to find the area of the region enclosed by the graphs of
y

√ x + 2 ,
x

− 2 , and
y

3 .

Round your result to 2 decimal place.

Solution

To find the area of the region enclosed by the graphs of the functions, we need to carefully set up an integral that represents the area.

Problem:

The graphs are given as:

  1. y=x+2y = \sqrt{x} + 2
  2. x=2x = -2
  3. y=3y = 3

The process involves finding the area between the curve y=x+2y = \sqrt{x} + 2 and the horizontal line y=3y = 3, bounded by x=2x = -2.

Steps:

  1. Find the intersection points:

    The area is bound vertically between y=3y = 3 and y=x+2y = \sqrt{x} + 2, so we need to determine the limits of integration by solving for where these two curves intersect: y=x+2=3y = \sqrt{x} + 2 = 3 x=1x=1\sqrt{x} = 1 \quad \Rightarrow \quad x = 1 So the curves intersect at x=1x = 1.

  2. Set up the integral:

    The integral will be set up from x=2x = -2 to x=1x = 1, and we are calculating the area between the line y=3y = 3 and the curve y=x+2y = \sqrt{x} + 2.

    The area is given by the integral of the difference between y=3y = 3 and y=x+2y = \sqrt{x} + 2: A=21(3(x+2))dxA = \int_{-2}^{1} \left( 3 - (\sqrt{x} + 2) \right) dx Simplifying the expression inside the integral: A=21(3x2)dx=21(1x)dxA = \int_{-2}^{1} (3 - \sqrt{x} - 2) dx = \int_{-2}^{1} (1 - \sqrt{x}) dx

  3. Evaluate the integral:

    Now, we can compute the integral term by term: A=211dx21xdxA = \int_{-2}^{1} 1 \, dx - \int_{-2}^{1} \sqrt{x} \, dx

Let's compute the value of the area.

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Math Problem Analysis

Mathematical Concepts

Integration
Area between Curves
Definite Integral

Formulas

A = ∫[a,b] (f(x) - g(x)) dx
Intersection points: solving √x + 2 = 3

Theorems

Fundamental Theorem of Calculus

Suitable Grade Level

Grades 11-12, College Level