Square roots
The root of a number y is another number, which when multiplied by itself a given number of times, equals y. The second root (also called the square root) of 16 is 4:
$$16=4×4$$
We write this as:
$$√16=4$$
or
$$√^2{16}=4$$
For every even-degree root (2nd, 4th, 6th ....) there are two roots. This is because multiplying two positive or two negative numbers both produce a positive result. E.g:
$$4×4=16$$
$$(−4)×(−4)=16$$
Thus, $√^2{16}=±4$
The value inside the symbol √(called radical) is called radicand. For $√^3{64};;;$ 64 is radicand and 3 is the index.
