Question

(3+√21) - √21 is a/ an _____ number.​

Answer 1

$\textbf{Answer:-}$

Rational number

(3+√21) - √21 is a/ an rational number.

Solution:

$= > (3 + \sqrt{21} ) - \sqrt{21}$

Removing the brackets:

$= > 3 + \sqrt{21} - \sqrt{21}$

$= > 3$

Now, 3 is a rational number since it can be written in the form of p/q ,i.e.,3/1 where 3 and 1 are integers and q,i.e.,1 is not zero.