Practice problem
Which of the following numbers are purely imaginary numbers?
iii
1+i1+i1+i
−1\sqrt{-1}−1
Eleventy-one
−7\sqrt{-7}−7
3−4i3-4i3−4i
−1-1−1
−9i-9i−9i
Type a concept, like “slope” or “photosynthesis”.