Question

if z+(1/z)=10. find z^2+(1/z^2) =
a)100
b)102
c)98
d)8​

Answer 1

Answer:

(c) is the correct answer of this question.

Step-by-step explanation:

here is the picture of answer.

Answer 2

Answer:

First we find value of z

$\frac{ {z}^{2} + 1 }{z} = 10 \\ = > 10z = {z}^{2} + 1 \\ = > \frac{ {z}^{2} }{z} = 9 \\ = > z = 9$

So,

${z}^{2} + (\frac{1}{z} {)}^{2} \\ = > 81 + \frac{1}{81} \\ = > \frac{6461 + 1}{81} = \frac{6462}{81} = 81\frac{1}{81}$