Question

3
prove that 5 - ___ √3
7​

Answer 1

Answer:

let 5-2/7 v3 be rational no.

therefore

5-2/7/3=p/q

(where p and q are co prime)

2/7/3=5-p/q

2/73=5q-p/q

V3=7(5q-p)/2q

here 7,5,2,q,and p are integers.

therefore 7(5q-p)/2q is rational

therefore v3 is rational no

but this contradicts the fact that v3 is irrational no

therefore 5-2/7V3 is irrational no.

hence proved.