Question

Please help!

1.Perform the indicated operation and write the result in the form a+bi
-9i(-9i+4)+3(8+8i)
A. 12+57i
B. 57-60i
C. -105-60i
D. -57-12i

Answer 1

D

Explanation:

Answer 2

-9i(-9i+4)+3(8+8i)

Use the distributive property to remove the parenthesis:

-9i * -9i = 81i^2

-9i x 4 = -36i

3x8 = 24

3x8i = 24i

Now you have 81i^2 - 36i + 24 + 24i

i^2 = -1

Now you have 81 x -1 - 36i + 24 + 24i

-81 +24 = -57

-36i +24i = -12i

Final answer = -57 - 12i

The answer is D.