ReIm notation

Let z = 6 + 5i and w = 3 - i.

Compute the following and express your answer in a + bi form.
w + 3z

Correct answer:

a =  21
b =  14

Step-by-step explanation:

z=6+5i w=3i  x=w+3z x=(3i)+3(6+5i) x=3i+3 6+3 5i x=3i+18+15i x=21+14i x=a+bi  a=21
b=14



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