Respuesta :

gmany

[tex]i=\sqrt{-1}\\\\\\sqrt{a\cdot b}=\sqrt{a}\cdot\sqrt{b}[/tex]

[tex]\sqrt{-20}=\sqrt{-1\cdot4\cdot5}=\sqrt{-1}\cdot\sqrt4\cdot\sqrt5=i\cdot2\sqrt5\\\\Answer:\ \boxed{A.\ 2i\sqrt5}[/tex]


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