Question

Prove that 2-3root 5 is an irrational number

Answer 1

hope this would help you......

Answer 2

Assume 2-3root5 be a rational no.

therefore 2-3root5 : ab

hence root 5: a-2b /3b is a ratio al no.

but root 5 is not a rational no.

because as we know that underoot is an imaginary no.

therefore 2-3root 5 is an irrational no.