1.

(3+√21) - √21 is a/ an _____ number.​

Answer»

\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.



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