# Is 2 rational or irrational

## Is ?/2 rational or irrational? Please explain

Types of Numbers 2: Rational Numbers, Irrational Numbers, Real Numbers

get and andProof by contradiction also known as reducto ad absurdum or indirect proof is an indirect type of proof that assumes the proposition that which is to be proven is false and shows that this assumption leads to an error, logically or mathematically. Thus, the proposition is true. Famous results which utilized proof by contradiction include the irrationality of and the infinitude of primes. This technique usually works well on problems where not a lot of information is known, and thus we can create some using proof by contradiction. Assume is rational , i. Now, since , we have , or.

Here you can read a step-by-step proof with simple explanations for the fact that the square root of 2 is an irrational number. It is the most common proof for this fact and is by contradiction. How do we know that square root of 2 is an irrational number? Maybe the pattern is very well hidden and is really long, billions of digits? Here is where mathematical proof comes in.

A rational number is any number that can be expressed as a fraction of two integers provided that the denominator is not zero. An irrational number is any number that cannot be expressed as a fraction of two integers where the denominator is not zero. This is a stronger condition than irrationality and implies it. In fact, in a technical sense, most real numbers are transcendental, though much of the time we deal with rational and other algebraic numbers. Proving that pi is irrational or even better that it is transcendental is beyond the scope of most Algebra courses. The simplest proofs involve the use of calculus.

They are called irrational meaning "not rational" instead of "crazy! Notice that the exponent is 2 , which is an even number. But to do this properly we should really break the numbers down into their prime factors any whole number above 1 is prime or can be made by multiplying prime numbers :. Notice that the exponents are still even numbers. The 3 has an exponent of 2 3 2 and the 2 has an exponent of 4 2 4. So we can see that when we square a rational number, the result is made up of prime numbers whose exponents are all even numbers.

A number is rational if we can write it as a fraction where the top number of the fraction and bottom number are both whole numbers. The term rational is derived from the word 'ratio' because the rational numbers are figures which can be written in the ratio form. Every whole number, including negative numbers and zero, is a rational number. Recurring decimals such as 0. Alternatively, an irrational number is any number that is not rational. It is a number that cannot be written as a ratio of two integers or cannot be expressed as a fraction.

Math Dr. Math Home What is an integer? It is often useful to think of the integers as points along a 'number line', like this: Note that zero is neither positive nor negative. About integers The terms even and odd only apply to integers; 2. Zero, on the other hand, is even since it is 2 times some integer: it's 2 times 0. To check whether a number is odd, see whether it's one more than some even number: 7 is odd since it's one more than 6, which is even. Again, this lets us talk about whether negative numbers are even and odd: -9 is odd since it's one more than , which is even.

## Proof: v2 is irrational

If you're seeing this message, it means we're having trouble loading external resources on our website., The decimal expansion of a rational number always either terminates after a finite number of digits or begins to repeat the same finite sequence of digits over and over. Moreover, any repeating or terminating decimal represents a rational number.

Proof that Square Root 2 is Irrational

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