it is a polygon and it would be a decagon since there are 10 sides
Answer: 
Step-by-step explanation:
Move all terms to one side.

Use the Quadratic Formula.
, 
Answer:
C.
and
Step-by-step explanation:
You have the quadratic function
to find the solutions for this equation we are going to use Bhaskara's Formula.
For the quadratic functions
with
the Bhaskara's Formula is:


It usually has two solutions.
Then we have
where a=2, b=-1 and c=1. Applying the formula:

Observation: 

And,

Then the correct answer is option C.
and