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aditya

· started a discussion

· 1 Months ago

aditya (Question: 200711.0 )

(x-1/x)= square root under x2+1/x2-2 should be there. please clarify

Question:
If x4 +  \(\cfrac{1}{x^4}\) = 23, then find the value of \(\left (x - \cfrac {1}{x} \right )^2\) . 
Options:
A) -3
B) 3
C) 7
D) -7
Solution:
Ans: (b) 


\(\left (x- \cfrac {1}{x} \right ) \ = x^2 + \cfrac{1}{x^2} - 2\)

= 5 – 2 = 3

ANSHUL PRATAP SINGH

· commented

· 1 Months ago

Yet to be approved!

alok ranjan

· commented

· 1 Months ago

same problem here
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