Question

(2+√5) (2-√5) is rational or irrational number ??
plz ans fast it is urgent ​with explain

Answer 1

Answer:

It irrational

Step-by-step explanation:

(2+√5)(2+√5)=(2+√5)^2

(2+√5)^2=4+5+4√5=>9+4√5

√5 is irrational

So (2+√5)(2+√5) is irrational

Hope that helps you :)

Answer 2

it think that it's rational because when use the identity (a-b)2 - (a+b)2= (a-b)2

you can solve it by this identity n get your answer