b. Find and sketch the domain of f(x, y, z) = Vz-x² – y²

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Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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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 \( z = x^2 + y^2 \).
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 \( z = x^2 + y^2 \).
Expert Solution
Step 1

(b) domain of function f(x,y,z) is set of those values of x,y,z where function f(x,y,z) is defined z-x2-y2 is defined only if z-x2-y20zx2+y2domain of function f(x,y,z)=x,y,z:zx2+y2

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