Math Problem Statement

Find the area A bounded by the curves x = y^2 - 7 and x = 8 - y^2. Round your answer to four decimal places.

Solution

The problem asks to find the area AA bounded by the curves x=y27x = y^2 - 7 and x=8y2x = 8 - y^2.

To solve this, we will:

  1. Find the points of intersection between the two curves by equating them: y27=8y2y^2 - 7 = 8 - y^2
  2. Solve this equation to find the limits of integration (the values of yy).
  3. Set up the integral for the area, which is the difference between the two functions x=8y2x = 8 - y^2 (the right curve) and x=y27x = y^2 - 7 (the left curve).
  4. Evaluate the integral to find the area.

Let's begin by solving for the points of intersection.

y27=8y2y^2 - 7 = 8 - y^2

This simplifies to:

2y2=152y^2 = 15

y2=152y^2 = \frac{15}{2}

y=±152=±302y = \pm \sqrt{\frac{15}{2}} = \pm \frac{\sqrt{30}}{2}

So, the limits of integration for yy are 302-\frac{\sqrt{30}}{2} to 302\frac{\sqrt{30}}{2}.

Now, we set up the integral for the area. The area between the curves is:

A=302302[(8y2)(y27)]dyA = \int_{-\frac{\sqrt{30}}{2}}^{\frac{\sqrt{30}}{2}} \left[(8 - y^2) - (y^2 - 7)\right] \, dy

Simplifying the integrand:

A=302302(152y2)dyA = \int_{-\frac{\sqrt{30}}{2}}^{\frac{\sqrt{30}}{2}} (15 - 2y^2) \, dy

I will now calculate this integral to find the area.The area AA bounded by the curves x=y27x = y^2 - 7 and x=8y2x = 8 - y^2 is approximately 54.772354.7723 square units, rounded to four decimal places.

Would you like further details or have any questions?

Here are some related questions to consider:

  1. How would the area change if one of the curves shifted vertically or horizontally?
  2. What are the geometric interpretations of these curves?
  3. Could you find the area between these curves using a different method, like parametric equations?
  4. How would the integral setup change if the curves were rotated?
  5. Can this process be applied to curves of higher degree?

Tip: Always double-check the points of intersection when solving for the area between curves, as incorrect limits can lead to errors in your final result.

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Math Problem Analysis

Mathematical Concepts

Calculus
Definite Integration
Area Between Curves
Quadratic Equations

Formulas

Equation of a parabola: x = y^2 + C
Area between curves: A = ∫ [f(y) - g(y)] dy

Theorems

Fundamental Theorem of Calculus
Definite Integration

Suitable Grade Level

Grades 10-12