Question

(√5+1)²=?
(√5-1)²:2=?

Answer 1

( √5 + 1 )^2 = 5 + 2√5 + 1 = 6 + 2√5
( √5 - 1 ) ^2 : 2 =( 5 - 2√5 + 1 ) : 2 = (6 - 2√5) : 2 = 3 - √5 .......

Answer 2

(√5+1)² = 5 + 2√5 + 1 = 6+2√5 ;

(√5 - 1)² : 2 = (5 - 2√5 + 1) : 2 = (6 - 2√5) : 2 = 3 - √5 ;