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No, it is an imaginary number (a special case of a complex number). The factor multiplying i can be written down as a ratio of two integers: 2/1. The word ratio comes from rational.

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12y ago
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Anonymous

Lvl 1
4y ago
So it is rational?

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Q: Is 2i an irrational number
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Related questions

Is the square root of negative 4 irrational?

No, but it is imaginary: 2i.


Evaluate square root of -4?

A raiz quadrada de um número negativo não é definida no conjunto dos números reais, mas pode ser avaliada no conjunto dos números complexos. Para − 4 −4 ​ , usamos a propriedade dos números complexos: − 4 = 4 ⋅ − 1 −4 ​ = 4 ​ ⋅ −1 ​ Sabemos que: 4 = 2 4 ​ =2 − 1 = 𝑖 −1 ​ =i, onde 𝑖 i é a unidade imaginária. Portanto: − 4 = 2 𝑖 −4 ​ =2i No conjunto dos números complexos, o resultado é 2 𝑖 2i.


The conjugate of the complex number 3 plus 2i is?

It is 3 minus 2i


What is the sum of an rational number and irrational number?

An irrational number.


What is the imaginary number of square root of -4?

Either 2i or -2i, when squared equal -4.


What is conjugation of 7-2i?

The conjugate of a complex number can be found by multiplying the imaginary part by -1, then adding the "real" part back. (-2i) * -1 = 2i, so the conjugation is 7+2i


Is an irrational number plus an irrational number rational?

No. The sum of an irrational number and any other [real] number is irrational.


The sum of a rational number and an irrational number is?

The sum of a rational and irrational number must be an irrational number.


Is 3.56 an irrational number?

No, 3.56 is not an irrational number. 3.56 is rational.


Whether a rational number multiplied by an irrational number gives an irrational number?

rational * irrational = irrational.


Is negative pi rational or irrational?

-Pi is irrational, because it does not terminate or repeat. Whenever you multiply an irrational number by a rational number (-1), the result is an irrational number.


Is the square root of -4 irrational?

The square root of -4 is not irrational, it is imaginary. Irrational numbers are numbers that cannot be expressed as a fraction, like the square root of 2. Irrational numbers, however, are a subset of real numbers. The square root of -4 however, is not even a real number because no real number, when squared, gives -4. Therefore the square root of -4 is an imaginary number.In calculus, the root is expressed as 2i where iis the square root of -1.