Simplify the following expression. (10-4i)(4-5i)+(-15+20i)
(10-4i)(4-5i)+(-15+20i) =
40 - 50i -16i + 20i^2 - 15 + 20i collect like terms ( note that i^2 = -1 so + 20 i^2 = -20)
5 -46i
+37165 
