Answer:
[tex]N=2 \sqrt{7} i[/tex]
Step-by-step explanation:
Imaginary or complex numbers
The complex numbers are identified from real numbers because they have an imaginary part, the unit [tex]i=\sqrt{-1}[/tex]
Our number is
[tex]N=\sqrt{-28}[/tex]
which can be expressed as
[tex]N=\sqrt{(-1)(4)(7)}[/tex]
[tex]N=\sqrt{-1} \sqrt{4} \sqrt{7}[/tex]
[tex]N=i (2) \sqrt{7}[/tex]
[tex]N=2 \sqrt{7} i[/tex]
