Question

if x+ 1/x=9, find value of x*2+ 1/x*2

Answer 1

☆Hello friend☆

x + 1/x = 9

Whole square of both sides,

(x+1/x)^2=9^2
x^2 +1/x^2×(2×x×1/x)=81
x^2 + 1/x^2=81-2
x^2 + 1/x^2= 79

$hope \: it \: helps$

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