Question
1.
2.
3.
4.
Answer (Detailed Solution Below)
Option 3 : $18$ / $18$
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Detailed Solution
सही उत्तर $18$ / $18$ है।
Key Points
Helpful?
prepsnap.in • Part -AQuestion:
If $x - \dfrac{1}{x} = 4$, find $x^2 + \dfrac{1}{x^2}$. / यदि $x - \dfrac{1}{x} = 4$ हो, तो $x^2 + \dfrac{1}{x^2}$ ज्ञात कीजिए।
1.
$16$ / $16$
2.
$14$ / $14$
3.
$18$ / $18$
4.
$20$ / $20$
Correct Answer: $18$ / $18$
$x^2+\frac{1}{x^2}=\left(x-\frac1x\right)^2+2=16+2=18$. / $x^2+\frac{1}{x^2}=\left(x-\frac1x\right)^2+2=16+2=18$।
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