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# Surds

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by

## Kat Zhyvitska

on 7 April 2011

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#### Transcript of Surds

Surds A surd is a root which cannot be reduced to a whole number. Rule of surds √ab= √a√b Surds are basically irrational roots. How to simplify a surd 1. Find the LARGEST square root that goes into the surd and how many times it goes into it.
e.g. √128 = √64x2

2. Turn the square root into seprate roots and x them together.
=√64x√2

3. Square root the root (leave the the other root as it is).
=8√2
Dont forget the + and - !

So the √128= +- 8√2 Example's √72=√36x2
=√36√2
=+-6√2 √200=√100x2
=√100√2
=+-10√2 √27=√9x3
=√9√3
=+-3√3 √48=√16x3
=√16√3
=+-4√3 √125=√25x5
=√25√5
=+-5√5 Thank you for watching By Kat, Ellie and Roxy
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