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If A = [(α,2),(2, α)] and |A^3| =125, then the value of α is

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If A = [(α,2),(2, α)] and |A3| =125, then the value of α is

(a)  ± 1 

(b)  ± 2 

(c)  ± 3 

(d)  + 5 

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1 Answer

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Best answer

Correct option   (c)  ± 3 

Explanation:

⇒ α2 - 4 = 5⇒  α2 = 9 ⇒ α2  = ±3

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