5x+1/x=10, then x²+1/25x² is equal to
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Step-by-step explanation:
5x+1/x=10
squaring
25x² + 1/x² + 2*5x*1/x = 100
⇒ 25x² + 1/x² = 90
dividing thru out by 25
x² + 1/25x² = 90/25
= 18/5
= 3.6
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