Question

x=2+√3,y=2-√3. (1) xy+1/xy ?

Answer 1

Answer:

2.

Step-by-step explanation:

x y + 1 / x y

= (2 + √3) (2 - √3) + 1 / (2 + √3) (2 - √3)

= (2)² - (√3)² + 1 / (2)² - (√3)²  [(a)² - (b)² = (a+b) (a-b)]

= 4 - 3 +1 / 4 - 3

= 2 / 1

= 2.