Question

please answer this question step by step​

Answer 1

Step-by-step explanation:

(y-1/y)²=y²+1/y²-2×y×1/y. [(a-b) ²=

a²+b²-2ab]

(y-1/y)²=11-2

(y-1/y)²=9

(y-1/y)²=(3)²

y-1/y=3