Question

if X + 1 by x is equal to 9 find X square + 1 by x square

Answer 1

hey your ans is here


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given

x+1/x=9

to find

x2+1/x2

now apply

(x+1/x)2=x2+1/x2+2×x×1/x[x gets cancelled]
(9)2=x2+1/x2+2
81-2=x2+1/x2
79=x2+1/x2

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