Prove root 2-3root5 is irrational
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2-3√5 is your question
•let us assume to the opposite i.e,
2-3√5 as rational .
•°•Therefore ,2-3√5 can be written in the form of a/b.
where a and b are co-prime numbers.
→2-3√5=a/b
→ -3√5=a/b-2
→ -3√5= a-2b/b
→ -√5=a-2b/3
•Where -√5 is an irrational number and a-2b/3 is a rational number.
Hence √5 is irrational.
This is a contradiction
i.e Rational≠Irrational.
Hence it is an irrational number.
Thank you!☺️
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