Question

if x-1/x=7 then find the value of x^2+1/x^2

Answer 1

x - 1/x = 7
or, (x - 1/x)² = (7)²
or, x² - 2.x.1/x + 1/x² = 49
or, x² + 1/x² - 2 = 49
or, x² + 1/x² = 49 + 2
or, x² + 1/x² = 51

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