Find and classify the critical points of f(x, y) = (y – 2)x² – y². Justify your answers.

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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## Problem Statement

Find and classify the critical points of \( f(x, y) = (y - 2)x^2 - y^2 \). Justify your answers.

### Solution Outline

To find the critical points of the function \( f(x, y) = (y - 2)x^2 - y^2 \), we need to follow these steps:

1. **Find the Partial Derivatives:**
   Determine the partial derivatives of the function with respect to \( x \) and \( y \).
   
2. **Set Partial Derivatives to Zero:**
   Set these partial derivatives equal to zero to find the critical points.
   
3. **Second Partial Derivative Test:**
   Use the second partial derivative test to classify the nature of each critical point.

### Step 1: Find the Partial Derivatives
Let \( f(x, y) = (y - 2)x^2 - y^2 \).

**Partial derivative with respect to \( x \):**

\( f_x = \frac{\partial}{\partial x} [(y - 2)x^2 - y^2] \)

\( f_x = (y - 2) \cdot 2x \)

\( f_x = 2x(y - 2) \)

**Partial derivative with respect to \( y \):**

\( f_y = \frac{\partial}{\partial y} [(y - 2)x^2 - y^2] \)

\( f_y = x^2 - 2y \)

### Step 2: Set Partial Derivatives to Zero
Set the partial derivatives equal to zero to find the critical points.

**For \( f_x = 0 \):**

\( 2x(y - 2) = 0 \)

\( x = 0 \quad \text{or} \quad y = 2 \)

**For \( f_y = 0 \):**

\( x^2 - 2y = 0 \)

### Solve Simultaneously

1. **Case 1:** \( x = 0 \)

\[ x^2 - 2y = 0 \implies 0 - 2y = 0 \implies y = 0 \]

So, one critical point is \( (0, 0) \).

2. **Case 2:** \( y = 2 \)

\[ x^2 - 2(2
Transcribed Image Text:## Problem Statement Find and classify the critical points of \( f(x, y) = (y - 2)x^2 - y^2 \). Justify your answers. ### Solution Outline To find the critical points of the function \( f(x, y) = (y - 2)x^2 - y^2 \), we need to follow these steps: 1. **Find the Partial Derivatives:** Determine the partial derivatives of the function with respect to \( x \) and \( y \). 2. **Set Partial Derivatives to Zero:** Set these partial derivatives equal to zero to find the critical points. 3. **Second Partial Derivative Test:** Use the second partial derivative test to classify the nature of each critical point. ### Step 1: Find the Partial Derivatives Let \( f(x, y) = (y - 2)x^2 - y^2 \). **Partial derivative with respect to \( x \):** \( f_x = \frac{\partial}{\partial x} [(y - 2)x^2 - y^2] \) \( f_x = (y - 2) \cdot 2x \) \( f_x = 2x(y - 2) \) **Partial derivative with respect to \( y \):** \( f_y = \frac{\partial}{\partial y} [(y - 2)x^2 - y^2] \) \( f_y = x^2 - 2y \) ### Step 2: Set Partial Derivatives to Zero Set the partial derivatives equal to zero to find the critical points. **For \( f_x = 0 \):** \( 2x(y - 2) = 0 \) \( x = 0 \quad \text{or} \quad y = 2 \) **For \( f_y = 0 \):** \( x^2 - 2y = 0 \) ### Solve Simultaneously 1. **Case 1:** \( x = 0 \) \[ x^2 - 2y = 0 \implies 0 - 2y = 0 \implies y = 0 \] So, one critical point is \( (0, 0) \). 2. **Case 2:** \( y = 2 \) \[ x^2 - 2(2
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