edited by
3,211 views

2 Answers

Best answer
24 votes
24 votes
$\quad \left(Z+\dfrac{1}{Z}\right)^{2}$

$= \left(z^{2} + 2(z)\left(\dfrac{1}{z}\right) + \left(\dfrac{1}{z}\right)^{2}\right) = \left(z^{2} + \dfrac{1}{z^{2}}\right)+2 =98$

$\Rightarrow 98-2 = 96$ is answer..
edited by
2 votes
2 votes
$\left(Z+\dfrac{1}{Z}\right)^{2}=98$

$\implies Z^{2}+\dfrac{1}{Z^{2}}+2Z\cdot \dfrac{1}{Z}=98$

$\implies Z^{2}+\dfrac{1}{Z^{2}}+2=98$

$\implies Z^{2}+\dfrac{1}{Z^{2}}=96$
edited by
Answer:

Related questions

16 votes
16 votes
4 answers
2
31 votes
31 votes
6 answers
3
gatecse asked Sep 15, 2014
8,643 views
When a point inside of a tetrahedron (a solid with four triangular surfaces) is connected by straight lines to its corners, how many (new) internal planes are created wit...
20 votes
20 votes
3 answers
4
gatecse asked Sep 15, 2014
4,842 views
In a survey, $300$ respondents were asked whether they own a vehicle or not. If yes, they were further asked to mention whether they own a car or scooter or both. Their r...