According to my algebra instructor, all irrational numbers space numbers that carry out not have square root that are even? according to what I"ve discovered online, irrational numbers can not be composed as a basic fraction. -9 is a whole number and therefore have the right to be converted right into a straightforward fraction, correct? however it has no square root? CONFUSED!


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-9 is no an irrational number due to a few things.

You are watching: Is square root of 9 a rational number

First, let"s take a look at the definition of a rational and irrational number.

The definition of a rational number is as follows:

Any number that deserve to be written as a portion with integers

The an interpretation of one irrational number is this:

A actual number the cannot be expressed in the form of a/b, (where b cannot same 0). In decimal form, that either never terminates or repeats itself.

So let"s take a look in ~ -9 with these two interpretations in mind,

What have the right to we carry out to the -9 to do it a fraction?

We deserve to divide it by 1 so now it looks choose this, -9/1.

Which the the two definitions best describes this number now?

I expect that ns have explained this adequately for her understanding.


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The answer to your inquiry on why -9 has actually no square root is further along in her studies, whereby you will learn to resolve the human being of complicated numbers.

The difficulty you space encountering is that there is no number that deserve to be multiplied by chin to gain -9, because if girlfriend remember multiplying prefer signs always give a hopeful number.

Not to leaving you in the dark it rotates then, the square root of -9, is 3i , the letter ns letting us know it’s not a actual number, in fact it"s imaginary!

Most calculators space not collection up to process imaginary numbers, therefore they just put words "Error" ~ above the screen, which is why it seems to not have a square root.

So in all reality using -9 is not a great example because that the proof of irrational/rational numbers, as it is neither.

(since the number to it is in squared to get -9, and the square root of -9 are not "real" numbers, and a number has to have a "Real" source to be part of the irrational/rational test you describe.)


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∏I watch where your man is comes from - over there is a missing "piece" in your explanation from her instructor - a rational number, when squared, has also exponents. This is a difficult definition to follow, however lets view if i can offer you an example.

2 is rational; 22 is it"s square, and also it"s exponent is an also number (2)

√2 is irrational; 21 is it"s square, and also the exponent here is one odd number (1)

√8 is irrational; 23 (=8) is it"s square, and also the exponent below is an odd number (3)

The an ext common definition used is the one detailed above by Katlin - a reasonable number is any number which can be created as a ratio, or portion (a/b).

Irrational numbers are consisted of of square root (other than the square root of perfect squares, prefer 4, 16, etc), greater order roots, the number pi, e, etc.

Hopefully that connects the dots between what friend heard in class, and also how to figure this out on your own!


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