evaluate the expression

Question

Evaluate the expression (3-3i)(-1+3i) and write the results in the form a+bi 

the real number a equals=

the real number b equals= 

Answer 1

Hi Dalia,

 

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

                 =-3+9i+3i-9i²

                 =-3+12i+9      (i²=-1)

                 =6+12i

 

a+bi=6+12i

 

a=6 and b=12