Question

The value of (5+√5)(5-√5)
is :
(a) o
(b) 25
(c) 20
(d) - 20​
can someone explain me step by step please...​

Answer 1

Answer:

answer is C 20

Step-by-step explanation:

solve using (a+b)(a-b) = (a^2 - b^2)

Answer 2

Answer:

apply formula

(a+b)(a-b)=a²-b²

so

(5+√5)(5-√5)=5²-√5²

25-5=20 solve

note

√5² is 5