Complex Numbers
For Example
 $\sqrt{16}$ can be written as $\sqrt{16}x\sqrt{1}$ = 4i where 4 is the real number and i can represent $\sqrt{1}$
Therefore $\sqrt{16}$ = 4i

$\sqrt{25}$ can be written as $\sqrt{25}x\sqrt{1}$ = 5i where 5 is the real number and i can represent $\sqrt{1}$
Therefore $\sqrt{25}$ = 5i

$\sqrt{5}$ can be written as $\sqrt{5}x\sqrt{1}$ where $\sqrt{5}$ is a real number and i can represent $\sqrt{1}$
Therefore $\sqrt{5}$ = i$\sqrt{5}$
The Complex Numbers are written in the form of a + bi where a and b are real numbers and i is an imaginary number.
For Example
 3 + 4i Where a is 3 and b is 4 and i is the imaginary number $\sqrt{1}$.
 2i Can be rewritten as 0 + 2i where a is 0 and b is 2 and i is the imaginary number $\sqrt{1}$.
The key to the Complex Numbers is the understanding that i is an imaginary number that is defined as $\sqrt{1}$ and that the accepted form is a + bi where a and b are real numbers and i is the imaginary component.
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