Question

(root11 -root7 )(root11+root7)​

Answer 1

( √11 - √7 ) × ( √11 + √7 )

[ use Identify ]

( a + b ) × ( a - b) = a² - b²

( √11 ) ² - ( √7 ) ²

11 - 7

4

Answer 2

Step-by-step explanation:

(root11 -

root 7) (root 11+root7)

+ - = -

so 11-7 = root 4