Question

efetue (5+3i).(10-i)

Answer 1

$(5+3i).(10-i)\\\\ 50-5i+30i-3i^2\\\\ i^2 = -1\\\\ 50-5i+30i+3\\\\\ \boxed{53+25i}$

Answer 2

(5+3i).(10-i)(PROPRIEDADE DISTRIBUTIVA)
50-5i+30i-3i²
50+25i-3i²
50+25i-3(-1)
50+25i+3
53+25i