Question

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Merry XMAS.
Question in the above attachment. ​

Answer 1

its b bit.

3-4√5

let as assume on the contrary that 3-4√5 is rational.

3-4√5 = p/q ( p and q are integers )

4√5 = p/q - 3

4√5 = p - 3q /q

√5 = p - 3q / 4q

............... see image plz........

merry Christmas....