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Irrational numbers are real numbers that cannot be expressed as the ratio of two integers. 
Common irrational numbers are nonrepeating and nonterminating decimals.These include the roots of any prime and most radicals.
Pythagoras's Proof that the is irrational
Given below is Pythagoras's proof of the existence of irrational numbers using the as an example.Simplifying Radicals
The symbol , is called a radical. The number underneath the symbol is the radicand. n is the root index, indicatingwhat the root is. When no number appears, 2 meaning square root is assumed. 
canalso be written as 2^{½}. In general, x^{a/b} means the bth root of x^{a}.Such rational exponents still follow the rules given inlesson 4.
Statements  Reasons 

= a/b  Proof by contradiction: assume true what we are proving false 
2=a^{2}/b^{2} 2b^{2}=a^{2}  Square both sides (expressions remain equal) 
a and b have no common factors  assumed without loss of generality: a/b represents reduced fraction 
If a is odd, a^{2} is odd, but 2b^{2} is clearly even, a contradiction  odd times odd is odd, a cannot be both even and odd simultaneously. 
If a is even, let a=2c  even can be factored into 2 and another number even (2) times anything is even 
a^{2} = a·a = 4c^{2} = 2b^{2}  Substitution of equals into product (twice) 
2c^{2}= b^{2}  Division Property of Equality 
So b is even; hence a,b have the common factor 2, a contradiction.  Q.E.D. (quod erat demonstrandum: Latin for which was to be proved.) 
When simplifying radicals, break the radicand into factors of perfect squares, cubes, etc. ( 9is the perfect square of 3, 4 is the perfect square of 2, 27 is the cube of 3). Separate the factors into separate radicals. Then express the roots of the radicals with perfect squares, cubes...For example:
Multiplying Radicals
When multiplying radicals, multiply the radicands of like root indexes and then simplify the product. Usually, the easiest way is to simplify as you go along so that you don't end up with large products to factor. Examples:Compare the next two examples and notice how they differ. Both methods are correct. Choose the one which saves you the most time.
Note when the radicals have different root indexes:
Rationalizing Denominators
Common practice is to simplify expressions to get rid of radicals in the denominator of fractions. Historically, this was all but necessary before calculators.(Imagine dividing by the by long division!)In order to rationalize the demoninator, the common practice of multiplying by one is used. One comes in many forms: anything divided by itself is one. So multiply the fractionby the square root that is in the denominator over itself.For example:Extracting Roots
The can be approximated on your calculator. Before calculators were developed, the following methodwas widely taught and used. It is based on Newton's Method which will be taught in calculus.Since the decimal representation of goes on forever without terminating or repeating,calculators can only give you a fairly precise decimal approximation.Whenever you use the decimal approximation of a radical, you should note that it is an approximation and not exact by the use of the symbol. 
 Separate the number into groups of two digits going each way from the decimal point.
 Estimate the largest square which will go into the first group.
 This number goes both in the normal divisor's location for long division and above the first group as in long division.
 Double this digit and bring it down for the next step (see example below).
 Also bring down the next group of digits as in long division.
 Estimate how many times the two digit number formed using this doubled digit and the number of times...will go into the number.
 Repeat steps 46 above, but now the number down will be 2, 3, 4 digits,etc. Continue until the desired accuracy is achieved.
Example of extracting root 2.
Step 1:?.??????______________  
?  /  2. 00 00 00 00 00 00 
Find an integer that squared goes into 2:
1_______________  
1  /  2. 00 00 00 00 00 00 