Question

solve the problem second one

Answer 1

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

5^2 -(/5)^2

25-5 = 20
proved





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Answer 2

(5+_/5) (5-_/5)
according to (a+b) (a-b)
LHS
(5)² - (_/5)²
25 - 5
20
20 = 20 PROVED
LHS = RHS