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  • a)
    a negative integer
  • b)
    none of these
  • c)
    a rational number
  • d)
    an irrational number
Correct answer is option 'C'. Can you explain this answer?
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a)a negative integerb)none of thesec)a rational numberd)an irrational ...
it can be written as ((√5+1)^2)^2+((√5-1)^2)^2 . now it is in the form of a^2 + b^2=(a+b)(a-b) . so (√5+1+√5-1)^2*(√5+1-√5+1)^2 = (√5)^2*(2)^2 = 5*4 =20. and 20 is a rational number
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