Question

Help pls √-4 - √-25
Express complex numbers in terms of i

Answer 1

that would become 2i minus 5i which gives you negative 3i

Answer 2

$i=\sqrt{-1}\\\\\sqrt{-4}=\sqrt{(4)(-1)}=\sqrt4\cdot\sqrt{-1}=2i\\\\\sqrt{-25}=\sqrt{(25)(-1)}=\sqrt{25}\cdot\sqrt{-1}=5i\\\\\sqrt{-4}-\sqrt{-25}=2i-5i=-3i$