Answer:
1-4i
Step-by-step explanation:
[tex]i=\sqrt{-1}[/tex]
We have [tex]1-\sqrt{-16}[/tex].
Let's look at the [tex]\sqrt{-16}[/tex] part.
Since it has a negative inside the square root, it is imaginary. This is our imaginary unit [tex]i=\sqrt{-1}[/tex].
So [tex]\sqrt{-16}[/tex]
[tex]=\sqrt{16} i [/tex]
[tex]=4i[/tex]
So [tex]1-\sqrt{-16}=1-4i[/tex]
