Here's where you can get 2 guides for your calculator (1 quick reference card, and a longer manual):
http://education.ti.com/calculators/downloads/US/Guidebooks/Detail?id=6134
To calculate square root of 25, enter
[2nd Function]
[square root key]
25
[close parenthesis key]
[ENTER key]
the TI 30XII-S calculator then calculates and displays the answer, 5.
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