Question

Simplify : (5+√5)(5-√5)

Answer 1

5^2 - (√5)^2 (its a identity..( a+b)(a-b)= a^2-b^2)
25-5
= 20

Answer 2

Answer:

20

Step-by-step explanation:

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

So (5+√5)(5-√5)=5^2-(√5)^2

=25-5

=20