Answer :

**Given: To prove: **is irrational.

**Proof:**

Let assume that is rational

Therefore it can be expressed in the form of , where p and q are integers and q≠0

Therefore we can write,

Squaring both sides we get,

Apply the formula ( a - b )^{2} = a^{2 }+ b^{2} - 2ab in ,

is a rational number as p and q are integers.

This contradicts the fact that √3 is irrational, so our assumption is incorrect.

Therefore is irrational.**Note: **Sometimes when something needs to be proved, prove it by contradiction.

Where you are asked to prove that a number is irrational prove it by assuming that it is rational number

and then contradict it.

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