Complex Numbers - Cheenta Academy

Tagged: complex numbers

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July 6, 2020 at 4:11 pm #75709
Prakash Kapadia
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Let X ={a+√-5 b : a,b ∈ Z}. An element x ∈ X is called special if there exists y ∈ X such that xy=1. The number of special elements in X is ?
July 7, 2020 at 8:57 am #75744
sundaresh sundaresh
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only two elements 1 and -1
July 7, 2020 at 8:58 am #75745
sundaresh sundaresh
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1 and -1 are the only special elements
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