algebra
posted by krystal .
square root of 45?
(using imaginary numbers)

http://www.google.com/search?q=sqrt+45&ie=utf8&oe=utf8&aq=t&rls=org.mozilla:enUS:official&client=firefoxa
Calculate square root without a calculator
Explanation of three ways to find square roots without calculator, including the Babylonian method.
http://www.homeschoolmath.net/teaching/squarerootalgorithm.php
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Math Forum: Ask Dr. Math FAQ: Square and Cube Roots
How do you find the square root of a number without a calculator? ... Start with the number you want to find the square root of. Let's use 12. ...
http://mathforum.org/dr.math/faq/faq.sqrt.by.hand.html
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Square Root Calculator
The Square Root Calculator will find the square root of the number you enter. ... Related Topic How to calculate square roots without a calculator ...
http://www.math.com/students/calculators/source/squareroot.htm
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How to manually find a square root
The way to do find a square root without a calculator.
http://math.arizona.edu/~kerl/doc/squareroot.html
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How to Find the Square Root of a Number
Learn how to find the square root of a number without using a calculator.
http://www.mathvideosonline.com/findthesquarerootofanumber.html 
by definition i = √1
so √45 = √1 x √9 x √5
= 3i√5