Question

Which expression is the equivalent to (4+7i)(3+4i)

Answer 1

Answer:

-16 + 37i

Step-by-step explanation:

First expand.

You get 12 + 16i + 21i + 28i^2.

Because $i=\sqrt{-1}$, you get 12 + 37i - 28 or -16 + 37i. $\blacksquare$