Question

efetue:

d) (4+1) . (2-1) +3-1

f) (-5i) . (4-3i) . (1 + 2i)

Answer 1

d) 8 - 4  +2 -1 +3 -1
    4 + 3 = 7

e) (-20i + 15i²) · (1+ 2i)
    (-20i -15) · (1 + 2i)
    -20i -40i² - 15 - 30i
    -50i +40 - 15
     25 - 50i