y ^ 2 + 1/(y ^ 2) = 11 , find the value of y - 1/y
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Step-by-step explanation:
y² + 1/y² = 11
=> y² + 1/y² - 2×y × 1/y = 11 - 2
=> (y - 1/y)² = 9
=>y - 1/y = 3
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