Question

how to solve this question Q.41​

Answer 1

a+b = (2-√5)^2 + (2+√5)^2))/(2+√5)(2-√5)

= (2-√5 +2+√5)^2 - 2( 2-√5)(2+√5))/ ( 4 -5)

= -16 + 2( -1)

= -18

(a+b)^3 = -5832