Question

Prove that 3 - √2 is irrational​

Answer 1

Answer:

3+√2 = a/b ,where a and b are integers and b is not equal to zero .. therefore, √2 = (3b - a)/b is rational as a, b and 3 are integers.. ... So, it concludes that 3+√2 is irrational

Answer 2

Let √3 - √2 be a rational number , say r

Then √3 - √2 = r

On squaring both sides we have

(√3 - √2)2 = r2

3 - 2 √6 + 2 = r2

5 - 2 √6 = r2

-2 √6 = r2 - 5

√6 = - (r2 - 5) / 2

Now - (r2 - 5) / 2 is a rational number and √6 is an irrational number .

Since a rational number cannot be equal to an irrational number . Our assumption that

√3 - √2 is rational is wrong

hope this helps you