An algebra problem by Varun Gupta

The square root of $-1$ is called The imaginary unit or unit imaginary number . The term "imaginary" is used because there is no real number having a negative square.

This imaginary unit , denoted as $i$ , is a mathematical concept which extends the real number system $ℝ$ to the complex number system $ℂ$ , which in turn provides at least one root for every polynomial $P(x)$

Note : The imaginary unit's core property is that ${ i^2 = -1 }$

Euler Equation