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PsychrolutesMarcidus
√-4 =√4i
Negavite square roots can be expressed as i

√4i /(3+i)-(2+3i)
= √4i/3+i -2 -3i
= √4i/1-2i

0= √4i/1-2i
  =( √4i/1-2i)²
  = 4i/(1-2i)²
  = 4i/(1-4i+4i²)
  = 4i/(1-4i+4)
  = 4i/(5-4i)