Question

Question:- If a²-5a-1=0 and a# 0; find:
i) a-¹/a
ii) a+ ¹/a
iii) a²-¹/a²
please give the answer to this question
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Answer 1

Answer:

I−A) is invertible we have

(I−A)(I+A+A

2

)=I−A

3

=I−0=I

(I−A)(I+A+A

2

)=I

∴I+A+A

2

=(I−A)

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