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Posted by **krystal** on Monday, October 13, 2008 at 9:50am.

(using imaginary numbers)

- algebra -
**Writeacher**, Monday, October 13, 2008 at 10:30amhttp://www.google.com/search?q=sqrt+-45&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

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/square-root-algorithm.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/square-root.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/square-root.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.math-videos-online.com/find-the-square-root-of-a-number.html

- algebra -
**Reiny**, Monday, October 13, 2008 at 10:44amby definition i = √-1

so √-45 = √-1 x √9 x √5

= 3i√5