[tex] \sqrt{121} = +11 and -11 [/tex] If you take the square root of something, you are looking for what number, when squared, will give you the number within the square root. Ex: [tex] \sqrt{9} = 3[/tex] [tex] 3^{2} = 9 [/tex]
so with [tex] \sqrt{121} [/tex] both [tex] -11^{2} [/tex] and [tex] +11^{2} [/tex] with give you 121
