Question

If x +1/x =5, what does 1/x2 + x2

Answer 1

x+1/x = 5

squaring on both sides

(x+1/x)² = 5²

x²+ 1/x² + 2(x× 1/x) = 25

x² + 1/x² +2 = 25

x² + 1/x² = 25-2

x² + 1/x² = 23

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Answer 2

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