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y = 2 + 3√5
x + y = 3 -2√5 + 2 + 3√5 = 5 + √5
x - y = 3 - 2√5 - 2 - 3√5 = 1 - 5√5
x*y = (3 - 2√5)(2 + 3√5) = 6 + 9√5 - 4√5 - 30 = -24 + 5√5
x/y = (3 - 2√5)/(2 + 3√5)= (3 - 2√5)(2 - 3√5)/(2 +3√5)(2-3√5) =
6 - 9√5 - 4√5 +30/2² -(3√5)² = 36 -13√5/-41