Question

If x+1/x=5 then what is the value of x^2+1/x^2

Answer 1

Heya!!

x + 1/x = 5

SQUARING BOTH SIDES

( x + 1/x )² = ( 5 )²

x² + 1/x² + 2 x ( 1/x ) = 25

x² + 1/x² = 25 - 2

x² + 1/x² = 23

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