Question

if a=2+√5 then a²= answer this please fast​

Answer 1

Answer:

given, a= 2+√5

now,a²= (2+√5)²

= 2²+2×2×√5+(√5)²

= 4+4√5+5

= 9+4√5

Answer 2

Answer:

a² = 9+4√5

Explanation:

Given

a= 2+√5

a²=(2+√5)²

a²= 2²+ 2.2.√5+(√5)²

a²= 4+4√5+5

a²= 9+ 4√5.