square roots

We call a radicand and b root.
Examples:                      
The square root of one hundred is ten

A whole number can have:

- two square roots (which are whole numbers):

  We usually name these two square roots with √9 and -√9

- two square roots (which aren’t whole numbers):


- one square root:

- no square roots:

 

 

 Exercise.- Calculate:

a) √121 =

b) √(-4) =

c) -√16 =

 

 

  Solutions: a) 11; b) Φ; c) -4