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1. All the four of the 2 x 2 matrix p = are non zero, and one of its eigen values is zero. Which of the following statements is true?
(A): P11P22 + P12P21 = 1
(B): P11P22 - P12P21 = - 1
(C): P11P22 - P12P21 = 0
(D): P11P22 - P12P21 = 1
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By: guest on 02 Jun 2017 12.56 am
Use [λI - P] = 0 ⇒(λ - P11)(λ - P22) - P21P12 = 0 Putting λ = 0, we get P11P22 - P21P12 = 0.
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