1.

यदि `x^(2)-4x-1=0` के लिए `x` एक वास्तविक संख्या है तो `x^(2)+1/(x^(2))` का मान क्या होगा?A. 4B. 10C. 12D. 18

Answer» Correct Answer - D
`x^(2)-4x-1=0`
`x^(2)-1=4x` (divide `x` both sides)
`x-1/x=4`
`x^(2)+1/x-2=16`
`x^(2)+1/(x^(2)=18`


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