Question

Q1. The value of (√11 -√7 )(√11 +√7) is: *

1 point

4

-4

18

-18​

Answer 1

4

Step-by-step explanation:

(√11 -√7 )(√11 +√7)

(√11)^2 - (√7)^2

11 - 7

4

Answer 2

Answer:

4

Step-by-step explanation:

(√11 - √7) (√11 + √7)

= (√11)² - (√7)²

[because (a-b)(a+b) = a² - b², here a = √11 and b = √7]

= (√11)² - (√7)²

= 11 - 7

= 4

Hence (√11 - √7)(√11 + √7) = 4

hope it helps.