Question

Q.1
2) (1+2i)³ (1-i)

² Express the following in the form a+ib, find a and b:

Answer 1

i

i

s

ss

s

s

z

z

z

z

z

x

x

x

x

x

xx

x

xx

x

xx

x

x

x

x

x

xx

x

x

x

x

x

x

x

x

x

x

xx

x

x

x

x

x

x

x

x

c

c

x

x

Answer 2

Answer:

-13+9i

step wise

(1+2i)3=(1) 3+3(1) 2(2i)+3(1)(2i) 2+(2i) 3 (1-i)

=1+6i−12−8i (1-i)

= (−11−2i) (1-i)

= -11 - 11i -2i + 2i*2

= -13 + 9i