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If x=9-4√5 , find the value …

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If x=9-4√5 , find the value of x+1/x

    • Posted by Digvijay Singh Puhan 4 years, 2 months ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Sakshi Singh 4 years, 2 months ago

    x=9-4√5 Since (a+b) (a-b) =a^2-b^2 (9-4√5= 1/(9+4√5 which is x Therefore we can write 1/x=9+4√5 =>x+1/x=(9-4√5) +(9+4√5) 9+9=18

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