Question

Which of these is a complex number? A. 9 + 375 OB. 5/1 3 - 2 oc. 2 - 1 / 1 OD. + A

Answer 1

Explanation:

Note: As you haven't clearly specified the answer choices. But, I am assuming one of the answer choices may have included some negative number under a square root, as a real number cannot have a negative number under a square root. So, whatever the choice may have contained the negative number under a square root would represent the complex number. Anyhow, I would try to clear your concept.

So, lets move forward.

A complex number is basically the combination of a real number and imaginary number which can be expressed in the form of $a+ib$. where a and b are termed as real numbers and i is a solution of the equation x² = -1.

So,

In  $a+ib$,

• "i" is called iota.
• $i=\sqrt{-1}$

For example, let us consider

$2 + \sqrt{-1}$

• Here, 2 is a real part,
• And $\sqrt{-1}$ is imaginary part, meaning $i=\sqrt{-1}$, which is imaginary part.

Therefore, $2 + \sqrt{-1}$ is a complex number.

Keywords: complex number, iota

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