Answer:
14-5i
Step-by-step explanation:
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12+3i-8i-2i^2
i^2 = -1
12+3i-8i-2(-1)
12+3i-8i+2
Combine like terms
14-5i
the zero(s) of function
is x=2
Step-by-step explanation:
We need to find the zero(s) of function algebraically.
We are given: 
To find the zeros we put the function equal to zero.

So, the zero(s) of function
is x=2
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9514 1404 393
Answer:
geometric sequence
Step-by-step explanation:
The terms of the sequence have a common ratio of -12/3 = -4, so the sequence is geometric. The general term is ...
an = 3(-4)^(n-1)
so the sum can be written as ...

(Note the summation starts at n=0, corresponding to a first term of 3.)