Question

If x-1/x =4,find value of x2+1/x2

Answer 1

Answer:

18

Step-by-step explanation:

Given, X - 1/X = 4

or, (X - 1/X)²=4² (Squared both side)

or,X²+1/X²- 2×X×1/X =16 ((as. (a-b)²=a²+b²+2ab))

or,x²+1/x² - 2 = 16

or, x²+1/x² = 16 + 2

or,x²+1/x²= 18 (ans)

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Answer 2

x-1/x=4
(x-1/x)^2=x^2+1/x^2-2
4^2= x^2+1/x^2-2
x^2+1/x^2=16+2
=18

There is your answer mate

Hope it helped!!