GATE EE 2015 Set 1 — Question 36
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Engineering Mathematics → Linear Algebra → Eigenvalues & Eigenvectors
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Question
The maximum value of "" such that the matrix has three linearly independent real eigenvectors is
Correct answer
(B) 13√(3)
Solution
Characteristic equationWhy the eigenvalues must be real and distinctFor any , the first two rows of , and , are linearly independent (the third entry of the first row is while that of the second is , and the second row is non-zero). So and every eigenvalue has only one independent eigenvector. Three independent real eigenvectors therefore require three distinct real eigenvalues.Condition for three distinct real rootsPut : . Then at .
- : local maximum .
- : local minimum .
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