Prove that2+root 5 is an irrational number Also check whether (2+root 5) (2-root 5) is rational or irratinal - Maths - Real Numbers

Question

Prove that​2  +root
5 is an irrational number Also check whether (2  +root
5) (2  -root
5) is rational or irratinal

Brijendra P. · Accepted Answer

Refer the similar link:
https://www meritnation
com/ask-answer/question/prove-that-2-3-5/real-numbers/2962340

Prove that​2 +root 5 is an irrational number. Also check whether (2 +root 5).(2 -root 5) is rational or irratinal