In my textbook it states that, "Like radicals have the same radicand and the same index."

Radicand = $\sqrt{x + 9}$ (x + 9 being the radicand.)
What does it mean by, "index" though?

Question

In my textbook it states that, "Like radicals have the same radicand and the same index."

Radicand = $\sqrt{x + 9}$ (x + 9 being the radicand.)
What does it mean by, "index" though?

luigi0210 · Answer

I think it means the power. Like in this:
$$\LARGE \sqrt[3]{27}$$
The index would be 3.

anonymous · Answer

index is the root. square root has index of 2, cube root has index of 3, fourth root has index of 4 and so on

luigi0210 · Answer

Picture time:

anonymous · Answer

Luigi thanks :-).