5 ms·

the answer is wrong. It's either -i or i.

• Tobu 16y ago
  Yeah, sqrt is only for non-negative reals. The question should be worded “what numbers in C have squares equal to minus one?”
• senki 16y ago
  Also, the answer could be 'j', for example, if you are an engineer.
• deleted 16y ago
  [deleted]
• zbanks 16y ago
  Or, depending on what kind of engineer, you may consider it to be undefined.