Question

Is ( 2 + under root 5) ( 2- under root 5) an irrational number??

Answer 1

Yes it is an irrational number.

Hope this helps you. .

- Khushali.S.S.

Answer 2

Hey Mate

Your answer is here

Let X = ( 2 + √5 )( 2 - √5 )

We know that,,,

( a + b )(a - b ) = a^2 - b^2

So,,

X = 2^2- √5^2

X = 4 - 5

X = -1

So,,, X is not a irrational number.

Thanks,,,,

Plz mark as brainiest.