Question

3) (3+√5)(3−√5) on simplification gives:
(a) 16
(b) 2√5
(c) 4
(d) 9​

Answer 1

(3+√5)(3-√5) = 3^2 - √5^2 = 9 - 5 = 4

So option c is correct.

Answer 2

(c) 4

Step-by-step explanation:

(3 + √5)(3 - √5)

=> (3)² - (√5)²....[by the formula (a+b)(a-b) = a²-b², here a = 3, b = √5]

=> 3² - √5²

=> 9 - 5

=> 4

So,

the simplification gives option (c) - 4.

hope it helps.

#BeBrainly :)