# What is i in complex numbers?

## Question:

What is i in complex numbers?

## Complex Numbers:

A complex number is made up of two parts: one real term and one imaginary term. The imaginary term contains the imaginary number, {eq}i {/eq}, that is equal to {eq}\sqrt{-1} {/eq}. Complex numbers are written as {eq}a+bi {/eq} where {eq}a {/eq} and {eq}b {/eq} are real numbers.

In a complex number, {eq}i {/eq} is the imaginary number for {eq}\sqrt{-1} {/eq}.

The imaginary number, {eq}i {/eq}, is calculated when solving the equation {eq}x^2=-1 {/eq}.

An example of a complex number is {eq}4+3i {/eq}.