How do you find the square root of 25?

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Answer 1 · 2017-01-25T19:28:27

$sqrt(25) = 5$

A square root of a number $n$ is a number $r$ such that $r^2 = n$

In the case of $25$ we find that $5^2 = 25$ , so $5$ is a square root of $25$ .

Note that $-5$ is also a square root of $25$ , in that:

$(-5)^2 = (-5)xx(-5) = 25$

"The" square root usually refers to the positive square root, sometimes known as the principal square root.

In symbols, we write:

$sqrt(25) = 5$

Note that $sqrt(...)$ refers to the principal square root. If we want to say that either square root can be used, we could write $+-sqrt(...)$