Question

the simplification of (5+√7) (5-√7)​

Answer 1

Answer:

18

Step-by-step explanation:

(5 + √7) (5 - √7)

=> (5)² - (√7)²

[by the formula (a+b)(a-b) = a² - b², here a = 5 and b = √7]

=> 5² - √7²

=> 25 - 7

=> 18

Hence (5 + √7) (5 - √7) = 18

hope it helps.