Question

(5+route 5 ) (5-route 5)​

Answer 1

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

hence, 25 - (√5)^2

25 - 5 =20

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Answer 2

Step-by-step explanation:

(5+√5)(5-√5)

by using identity,

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

=5^2-√5^2

=25-5

=20