1.

(5-√5)(5+√5)

Answer» 5^2-√5^2=10-5=5
20
(a - b) (a + b) = a2 - b2(5 - √5)(5 + √5) = 52 - √5 2= 25 - 5= 20
5(5+*5) - *5(5+*5) = 25+5*5 - 5*5+ 5 = 30
A


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