Square root
A square root of a number is a number
such that
. Generally, the square root only takes the positive value of
. This can be altered by placing a
before the root. Thus
is a square root of
if
is the square of
.
Notation
The square root (or the principle square root) of a number is denoted
. For instance,
. When we consider only positive reals, the square root function is the inverse of the squaring function.