Question

Simplify each of the following expressions:-
$(5 + \sqrt{5}) (5 - \sqrt{5} )$
Please answer fast urgent tomorrow I have exam​

Answer 1

(5+√5)(5−√5) ≡ (A+B)(A−B)

∵ A²−B²=(A+B)(A−B) : A,B ∈ ℂ

=> (5+√5)(5−√5) = (5)² − (√5)² = 25−5 = 20

Answer 2

Answer:

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