Question

show that (2+√5)^2is irrational​

Answer 1

Step-by-step explanation:

Step 1. (a+b)^2=a^2+b^2+2ab......

Step.2 4+5+2x2x√5......

Step.3. 9+4√5........

Note:- 9 is a perfect square of 3.....and it's a rational number....

Note:- √5 is not a perfect square and it's a irrational number.....