Question

Calcule:

a) (7+4i)+(3-9i)
b) (2-5i)-(1+9i)
c) 6i+(15+8i)+(-3+11i)
d) (1/2-12i)+3-(1/4+7i)-3i

Answer 1

a) (7+4i)+(3-9i)
     7+4i+3-9i = 10-5i

b) (2-5i)-(1+9i)
    2-5i-1-9i = 1-14i

c) 6i+(15+8i)+(-3+11i)
    6i+15+8i-3+11i = 12+25i

d) (1/2-12i)+3-(1/4+7i)-3i
    1/2-12i+3-1/4-7i-3i
    2/4-12i+12/4-1/4-7i-3i = 13/4-22i

Answer 2

A)10-5i
B)1-14i
C)12+25i
D)13/4-22i