Changes

:<math>\sqrt{-1}= \pm i</math>.

:<math>\sqrt{-1}= \pm i</math>.

When a imaginary number is added to real number, they form a [[complex number]]. Imaginary numbers are mathematically useful because they ensure that every polynomial [[equation]] has a solution - for example, the equation <math>x^2+1=0</math> has no real solution.

When a imaginary number is added to real number, they form a [[complex number]]. Imaginary numbers are mathematically useful because they fabricate solutions to every polynomial [[equation]] - for example, the equation <math>x^2+1=0</math> has no real solution.

The analysis of imaginary numbers forms the basis for the field of [[mathematics]] known as  

The analysis of imaginary numbers forms the basis for the field of [[mathematics]] known as