Question

$if x + \frac{1}{x } = 20 \: then \: {x }^{2} + \frac{1}{ {x}^{2} } = what$

Answer 1

hey your ans is here

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given:-

x+1/x=20

to find:-

x2+1/x2

now apply

(x+1/x)2=x2+1/x2+2
(20)2=x2+1/x2+2
400-2=x2+1/x2
398=x2+1/x2

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