Prove that `2sqrt7` is irrational.
Let is rational
(∵ Q division of two rational no. is also rational)
`:. sqrt7` is rational
but this is contradition that is irrational.
`:.2sqrt7` is irrational
Concept: Proofs of Irrationality
Is there an error in this question or solution?
Video TutorialsVIEW ALL 
Video Tutorials For All Subjects
- Proofs of Irrationality