Question

Multiply the complex numbers: (4 + 6i)(1∕2 + 3i)

Question 9 options:

A)

–20 + 15i

B)

20 + 15i

C)

–16 + 15i

D)

16 + 15i

Answer 1

B) 20 + 15i

Explanation:

So first you need to foil the equation (a + bi)(c + di) = ac +adi +bic +bidi. then you need to combine like terms. Remember that i^2 = 1 and i = i.

Then write your final answer in the terms a + bi