Compute the discriminant D(x, y) of the function. f(x, y) = x³ + y4 - 6x-2y² + 1 (Express numbers in exact form. Use symbolic notation and fractions where needed.) D(x, y) = Which of these points are saddle points? (-√2, 1) (-√2,0) (√2, -1) (√2,0) (-√2, -1) (√2, 1) Which of these points are local minima? (-√2,-1) (√2,-1) (√2, 1) (-√2,0) (-√2, 1) (√2,0)

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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**Title: Understanding Discriminants and Critical Points in Multivariable Calculus**

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**Compute the Discriminant \( D(x, y) \) of the Function**

Given the function:

\[ f(x, y) = x^3 + y^4 - 6x - 2y^2 + 1 \]

Express numbers in exact form. Use symbolic notation and fractions where needed.

\[ D(x, y) = \]
\[ \text{[Input box for the discriminant calculation]} \]

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**Identifying Saddle Points**

Which of these points are saddle points?

- [ ] \((- \sqrt{2}, 1)\)
- [ ] \((- \sqrt{2}, 0)\)
- [ ] \((\sqrt{2}, -1)\)
- [ ] \((\sqrt{2}, 0)\)
- [ ] \((- \sqrt{2}, -1)\)
- [ ] \((\sqrt{2}, 1)\)

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**Identifying Local Minima**

Which of these points are local minima?

- [ ] \((- \sqrt{2}, -1)\)
- [ ] \((\sqrt{2}, -1)\)
- [ ] \((\sqrt{2}, 1)\)
- [ ] \((\sqrt{2}, 0)\)
- [ ] \((- \sqrt{2}, 1)\)
- [ ] \((\sqrt{2}, 0)\)

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This exercise involves computing the discriminant to classify critical points of a multivariable function. Saddle points and local minima are particular types of critical points characterized by the behavior of the function around these points.
Transcribed Image Text:**Title: Understanding Discriminants and Critical Points in Multivariable Calculus** --- **Compute the Discriminant \( D(x, y) \) of the Function** Given the function: \[ f(x, y) = x^3 + y^4 - 6x - 2y^2 + 1 \] Express numbers in exact form. Use symbolic notation and fractions where needed. \[ D(x, y) = \] \[ \text{[Input box for the discriminant calculation]} \] --- **Identifying Saddle Points** Which of these points are saddle points? - [ ] \((- \sqrt{2}, 1)\) - [ ] \((- \sqrt{2}, 0)\) - [ ] \((\sqrt{2}, -1)\) - [ ] \((\sqrt{2}, 0)\) - [ ] \((- \sqrt{2}, -1)\) - [ ] \((\sqrt{2}, 1)\) --- **Identifying Local Minima** Which of these points are local minima? - [ ] \((- \sqrt{2}, -1)\) - [ ] \((\sqrt{2}, -1)\) - [ ] \((\sqrt{2}, 1)\) - [ ] \((\sqrt{2}, 0)\) - [ ] \((- \sqrt{2}, 1)\) - [ ] \((\sqrt{2}, 0)\) --- This exercise involves computing the discriminant to classify critical points of a multivariable function. Saddle points and local minima are particular types of critical points characterized by the behavior of the function around these points.
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