Question

Prove that root 3 is an irratirrational

Answer 1

Let us assume that √3 is a rational number. Then, as we know a rational number should be in the form of p/q. where p and q are co- prime number.

So, √3 = p/q { where p and q are co- prime}

√3q = p

Now, by squaring both the side

we get,

(√3q)² = p²

3q² = p² ... ( i )

So,

if 3 is the factor of p²

then, 3 is also a factor of p ... ( ii )

Let p = 3m { where m is any integer }

squaring both sides

p² = (3m)²

p² = 9m²

putting the value of p² in equation ( i )

3q² = p²

3q² = 9m²

q² = 3m²

So, if 3 is factor of q²

then, 3 is also factor of q

Since, 3 is factor of p & q both

So, our assumption that p & q are co- prime is wrong.

hence, √3 is an irrational number.

#BeBrainly

Answer 2

I hope it would be very helpful. Happy day