Answer:
5i
Step-by-step explanation:
Using the rule of radicals
[tex]\sqrt{a}[/tex] × [tex]\sqrt{b}[/tex] = [tex]\sqrt{ab}[/tex] and
[tex]\sqrt{-1}[/tex] = i
Given
[tex]\sqrt{-25}[/tex]
= [tex]\sqrt{25(-1)}[/tex]
= [tex]\sqrt{25}[/tex] × [tex]\sqrt{-1}[/tex]
= 5i
