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How to show 2/root 5 as irrational

Answer»

To prove 2✓5 as irrational .

LET 2✓5 be a rational number
2✓5=P/Q. where p and q are integers.
✓5=p/2Q

as we know P /2q is is a rational number show root 5 will also be a rational number but we know that root 5 is irrational number so contradiction is wrong 2✓5 will be a irrational number .



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