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i'm very weak at algebra. So can anyone plz say me if (x+1/x)=4 then (x-1/x)=? nd why??

#Mathematics #Algebra

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Manish Shankar ·2009-07-09 04:59:37

i'm very weak at algebra. So can anyone plz say me if (x+1/x)=4 then (x-1/x)=? nd why??

(x+1/x)=4
squaring
x²+1/x²+2=16
x²+1/x²=14
x²+1/x²-2=12
(x-1/x)²=12

x-1/x=Â±2√3

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â™ªdoom3 â™« ·2009-07-09 05:07:45

Thanx.Now p;z can you suggest me any book than can help me improve myself at Algebra??

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Yajnaseni Guha ·2009-07-09 05:27:43

There's no specific book which will help you improve in algebra....the only way is to practice extensively...u can refer to M.L.AGGARWAL books...thats a good book beginners.

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1357

Manish Shankar ·2009-07-09 05:27:47

Higher Algebra by Hall and Knight

its good

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