[4] (a) Find all a so that 1 −1 +-(0) A = 1 2 1 -1 1 4 is positive definite (note it is already symmetric for any a). (b) Repeat exercise (a) for the matrix - (2 A = -1 1 -1 1 4 a 2

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section: Chapter Questions
Problem 53RE
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Positive definite

[4]
(a) Find all a so that
A =
α
1
1 2
-1 1
−1
1
4
is positive definite (note it is already symmetric for any a).
A =
(b) Repeat exercise (a) for the matrix
- (³
2 a -1
2 1
-1 1 4
(where, again, it is already symmetric for any a).
Transcribed Image Text:[4] (a) Find all a so that A = α 1 1 2 -1 1 −1 1 4 is positive definite (note it is already symmetric for any a). A = (b) Repeat exercise (a) for the matrix - (³ 2 a -1 2 1 -1 1 4 (where, again, it is already symmetric for any a).
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