Question

(√ 5 + √ 7) ( √ 5 -√ 7)​

Answer 1

Answer:

(√5+√7) (√5-√7)

a^2-b^2

(√5)^2 - (√7)^2

5-7

= -2.

Answer 2

(√5+√7)(√5-√7)

using identity:(a+b)(a-b)=(a²-b²)

(√5)²-(√7)²

5-7

-2