Convert the rectangular equation to polar form and sketch its graph. y² = 4x -4 -4 -2 -2 π/2 4 2 -2 π/2 4 2 -2 2 2 4 4 0 0 -4 -4 -2 -2 π/2 4 2 -2 π/2 4 2 2 2 4 4 0 0

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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# Converting Rectangular Equation to Polar Form

## Problem Statement:
Convert the rectangular equation to polar form and sketch its graph.

## Equation Given:
\[ y^2 = 4x \]

### Graphs of Possible Polar Representations:

#### Graph Descriptions:
1. **Graph (Top Left)**:
   - This graph depicts a curve opening to the right. The curve passes through the point \( (0,0) \) and extends to positive x-values.

2. **Graph (Top Right)**:
   - This graph shows a parabolic curve opening upwards. The vertex of the parabola is at the origin \( (0,0) \), and it extends in both positive and negative directions along the x-axis.

3. **Graph (Bottom Left)**:
   - This graph presents a curve opening to the left. The curve passes through the origin \( (0,0) \) and expands to negative x-values.

4. **Graph (Bottom Right)**:
   - This graph illustrates another parabolic curve opening upwards, similar to the top right graph. The curve passes through the origin \( (0,0) \).

### Explanation of Correct Graph:
To identify which graph corresponds to the equation \( y^2 = 4x \) after converting to polar coordinates:

1. The standard form for a parabola opening to the right is \( y^2 = 4ax \), indicating that it would exhibit symmetry along the y-axis and open towards the positive x-direction.
2. The transformation into polar coordinates does not break this symmetry.

Therefore, the correct graph for the given equation is the **Top Left Graph**.

### Answer Key:
- The blue circle (o) next to the top left graph indicates this graph is the correct portrayal for the given equation.
Transcribed Image Text:# Converting Rectangular Equation to Polar Form ## Problem Statement: Convert the rectangular equation to polar form and sketch its graph. ## Equation Given: \[ y^2 = 4x \] ### Graphs of Possible Polar Representations: #### Graph Descriptions: 1. **Graph (Top Left)**: - This graph depicts a curve opening to the right. The curve passes through the point \( (0,0) \) and extends to positive x-values. 2. **Graph (Top Right)**: - This graph shows a parabolic curve opening upwards. The vertex of the parabola is at the origin \( (0,0) \), and it extends in both positive and negative directions along the x-axis. 3. **Graph (Bottom Left)**: - This graph presents a curve opening to the left. The curve passes through the origin \( (0,0) \) and expands to negative x-values. 4. **Graph (Bottom Right)**: - This graph illustrates another parabolic curve opening upwards, similar to the top right graph. The curve passes through the origin \( (0,0) \). ### Explanation of Correct Graph: To identify which graph corresponds to the equation \( y^2 = 4x \) after converting to polar coordinates: 1. The standard form for a parabola opening to the right is \( y^2 = 4ax \), indicating that it would exhibit symmetry along the y-axis and open towards the positive x-direction. 2. The transformation into polar coordinates does not break this symmetry. Therefore, the correct graph for the given equation is the **Top Left Graph**. ### Answer Key: - The blue circle (o) next to the top left graph indicates this graph is the correct portrayal for the given equation.
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