Question

Would be great if someone explained this

Answer 1

A. 2.

A radical is an expression which implies the use of a root.

There are three components of a radical expression:

(i) The root "√".

(ii) The radicand √"a".

(iii) The degree or index of the radical $\sqrt["n"]{a}$, when index of the radical is not shown then it understood to be a index of 2.

The index is the number used to indicate the degree of the root.

For the example $\sqrt{10}$, 10 is the radican and the index is not shown so it understood is 2.