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Since it is the square root of a negative number, it is actually imaginary, neither rational nor irrational. It is equal to 9i, or 9 times whatever the square root of negative one is.


square root of -81 = square root of 81 times i = 9i

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โˆ™ 2009-10-03 05:27:18
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Q: Is the square root of -81 rational or irrational?
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Related questions

Is the root of 81 an irrational number?

No. The square root of 81 is 9, which is a rational number.


Is sqrt 81 a irrational number?

No because the square root of 81 is 9 which is a rational number


Is the square root of of 81 over negative three irrational?

No. The square root of 81/(-3) is rational. The square root of [81/(-3)] is imaginary (a kind of complex number).


Is 81 a irrational number?

No. 81 is a rational number. An irrational number is a number with an endless amount of digits like pi or the square root of 2.


Is the square of 81 a rational number?

The square root of 81 is 9 which is a rational number


Is the square root of 81a rational number?

Yes. The square root of 81 is 9, which is a rational number.


Is the square root of 81 irrational?

no. it is 9


Is the square root of 81 an irrational number?

No.


Is the square root of 81 rational?

Yes. The square root of 81 is 9 - a natural number and all natural numbers are rational numbers.


Is 81 squared rational or irrational?

81*81 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.


Is -81 is rational or irrational?

Rational.


Which type of number is square root of 81?

Integer, rational, and real.


Is the square root of 81 a rational number?

Yes. It's +9 and -9. They're both rational.


Is 81 an irrational numbers?

No it is a rational number


Is 9 squared rational or irrational?

81 is rational. Rational numbers are numbers that can be written as a fraction. Irrational numbers cannot be expressed as a fraction.


What is the value of n for which square root of n be a rational number?

n is a square of a rational number. For example, 4 or 81, or 2.25 or 36/25.n is a square of a rational number. For example, 4 or 81, or 2.25 or 36/25.n is a square of a rational number. For example, 4 or 81, or 2.25 or 36/25.n is a square of a rational number. For example, 4 or 81, or 2.25 or 36/25.


Is 39.81 with a line over 81 irrational?

No, it is rational.


Square root of 81?

81 is the square root and 9.5 is under root.


Is the square root of 102 an irrational number?

Yes, 102 isn't a square number (1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144) so the square root of 102 will keept going forever and is irrational.


What is the square root of 81 and 4?

The square root of 81 is 9 and the square root of 4 is 2!


Irrational number between 8 and 9?

An irrational number is a number which cannot be expressed as a fraction made of integers. These numbers generally have infinite decimals with no pattern to them whatsoever. The easiest way, I think, to make an irrational number is to take the square root of a number between the squares of your parameters, in this case between 64 and 81. Thus a number such as square root(72), which is 8.485281..., or square root(80), which is 8.944571..., will do nicely.


What number is 81 a square root of?

The square root of 6561 is 81


How do you write 81 as a square root?

The square root of 81 is 9


Is 81 a rational or irrational number?

81 as well as all whole numbers are rational numbers. Any number that can be written as a fraction is a rational number. An irrational number can be written as a decimal, but not as a fraction. An irrational number has endless non-repeating digits to the right of the decimal point. An example of an irrational number would be pi: π = 3.141592…


How do you reverse a square root?

The opposite of a square root is the square of a number. For example, the principal square root of 81 is 9, while the square of 9 is 81.

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