Question

. If x-1/x=3, then the value of x2

+ 1/ X2

is :

(A) 7 (B) 9 (C) 5 (D) 11​

Answer 1

Answer:

(A) 7..

Step-by-step explanation:

x+ 1/x = 3…(i)

We know , (x+1/x)² = x² + (1/x)² + 2(x * 1/x)

=> (x+1/x)² = x² + (1/x)²+ 2

Substituting value from (i) (3)²2 = x²+(1/x)²+2

= 9–2 = x²+(1/x)²

Ans. x² + (1/x)² = 7.

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