b. Find and sketch the domain of f(x, y, z) = Vz-x² – y²
Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
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1b
![**Problem Statement:**
Find and sketch the domain of the function \( f(x, y, z) = \sqrt{z - x^2 - y^2} \).
**Explanation:**
The function \( f(x, y, z) = \sqrt{z - x^2 - y^2} \) is defined only for non-negative values under the square root. Therefore, the expression \( z - x^2 - y^2 \) must be greater than or equal to zero:
\[ z - x^2 - y^2 \geq 0 \]
This can be rewritten as:
\[ z \geq x^2 + y^2 \]
The inequality \( z \geq x^2 + y^2 \) represents the region above the paraboloid in three-dimensional space. The paraboloid is centered along the z-axis and opens upward.
**Graphical Representation:**
To visualize the domain:
1. **Identify the shape of the domain**: The inequality \( z \geq x^2 + y^2 \) describes the region above the paraboloid in 3D space, where each "slice" perpendicular to the z-axis is a circle (since \( x^2 + y^2 = z \) forms a circle in the xy-plane for constant z).
2. **3D Visualization**: In a 3-dimensional coordinate system:
- The xy-plane is horizontal.
- The z-axis is vertical.
- The paraboloid is the surface where \( z = x^2 + y^2 \).
3. **Domain Interpretation**: The domain of \( f \) includes all points (x, y, z) where z is greater than or equal to \( x^2 + y^2 \).
In conclusion, the domain of the function consists of the set of points that lie on or above the surface of the paraboloid defined by \( z = x^2 + y^2 \).](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa01c18cd-a3eb-4112-9efe-7c93aae07195%2F82bacab7-fdf2-4421-bc68-925b28aad530%2F1j5ckjd_processed.png&w=3840&q=75)
Transcribed Image Text:**Problem Statement:**
Find and sketch the domain of the function \( f(x, y, z) = \sqrt{z - x^2 - y^2} \).
**Explanation:**
The function \( f(x, y, z) = \sqrt{z - x^2 - y^2} \) is defined only for non-negative values under the square root. Therefore, the expression \( z - x^2 - y^2 \) must be greater than or equal to zero:
\[ z - x^2 - y^2 \geq 0 \]
This can be rewritten as:
\[ z \geq x^2 + y^2 \]
The inequality \( z \geq x^2 + y^2 \) represents the region above the paraboloid in three-dimensional space. The paraboloid is centered along the z-axis and opens upward.
**Graphical Representation:**
To visualize the domain:
1. **Identify the shape of the domain**: The inequality \( z \geq x^2 + y^2 \) describes the region above the paraboloid in 3D space, where each "slice" perpendicular to the z-axis is a circle (since \( x^2 + y^2 = z \) forms a circle in the xy-plane for constant z).
2. **3D Visualization**: In a 3-dimensional coordinate system:
- The xy-plane is horizontal.
- The z-axis is vertical.
- The paraboloid is the surface where \( z = x^2 + y^2 \).
3. **Domain Interpretation**: The domain of \( f \) includes all points (x, y, z) where z is greater than or equal to \( x^2 + y^2 \).
In conclusion, the domain of the function consists of the set of points that lie on or above the surface of the paraboloid defined by \( z = x^2 + y^2 \).
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