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Because multiplying negative numbers together gives a positive answer. So the square root of nine is both three and minus three.

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Q: Why does every positive numbers have 2 square roots?
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Related questions

What are positive square roots called?

They are called real numbers. Negative square roots must be complex numbers.


Do Positive numbers have negative square roots?

Every positive number has two square roots. Their absolute values are the same. One is positive and the other is negative.


How many square roots does every number have?

All positive numbers have two. 0 has only one. Negative numbers have two imaginary roots but no real ones.


Positive numbers have negative square roots?

False


How many square roots can a positive number have?

Every positive number has two square roots, though the roots are not always whole numbers (or even rational numbers). The more obvious of each numbers roots is the positive one.The positive square root of 4 is 2, because 2*2=4.The positive square root of 5 is roughly 2.236068.The other square root of a number is the negative inverse of their positive root. This is because when two negative numbers are multiplied together the negative signs "cancel out", leaving a positive number.The negative square root of 4 is -2, because -2*-2=4.The negative square root of 5 is roughly -2.236068.Zero has only one square root, itself, and no negative number has any (real number) square roots, since no number multiplied by itself will result in a negative.


Positive numbers have two square roots a principal square root and its?

And its negative counterpart.


Why does every positive have two square roots?

Because two negative numbers when multiplied together make a positive number. Second, two positive numbers multiplied together make a positive number. Here is an example: What is the square root of 64? 8 X 8 = 64 -8 X -8 = 64 So the two square roots of 64 are 8 and -8.


Numbers that are square roots that are whole numbers?

Every whole number


Are irrational numbers square roots?

Usually they are. More specifically, if you take the square root of a positive integer, there are only two possibilities:* If you take the square root of a perfect square, you get a whole number. * In all other cases, you get an irrational number.


What are the positive and negative square roots of 1?

The numbers 1 and negative 1 (-1) are both square roots of positive 1.The square root of negative 1 is the "imaginary" number i.


What is the square roots for -41.2?

There are none. Negative numbers don't have square roots. Well, they do, but they are known as imaginary numbers, and there is no way to determine them. A square root of a number is a number you can multiply by itself and get the original number. There is no number you can multiply by itself to get a negative number, but every positive number has two square roots of the same absolute value.


All poitive numbers have two square roots a positive and as negative and why?

This is because if you multiply two negative numbers you get positive.