Question

Can someone explain why I got this wrong? I chose D.

Multiply (9 − 4i)(2 + 5i).

−2 + 37i

18 − 20i2

38 + 37i

18 + 37i − 20i2

Answer 1

Did you FOIL?

Answer 2

FOIL it

Answer 3

Well I said D and it said the answer was wrong????

Answer 4

@stefrheart

Answer 5

d is not right :(

Answer 6

Well when you FOIL it you got to remeber that the last part \[i^2 = -1\]

Answer 7

YEAH???

Answer 8

It's c isn't it.....

Answer 9

\[(9-4i)(2+5i)\]
\[(18+45i-8i-20i^2)\]
\[18+37i-20(-1)\]
\[38+37i\]

Choice C

Answer 10

yes

Answer 11

Wow, completely forgot about that step. FP.