Question

Ifx-1/x=4, then find the value of x^2+1/x^2
plz. help me fast....
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Answer 1

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Here's ur answer

x - 1/x = 4

(x - 1/x)² = x² + 1/x² - 2*x*1/x

4² = x² + 1/x² - 2

x² + 1/x² = 16+2

x² + 1/x² = 18

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Answer 2

Answer:

18

Step-by-step explanation:

x-1/x=4

Squaring on both sides we get,

(x-1/x)^2=16

x^2+1/x^2-2=16

x^2+1/x^2=16+2=18

The answer is 18