As your question is stated, there is no answer!
I'm going to assume the polynomial you meant is:
To create a perfect square trinomial, take half the coefficient of x and then square it.
In all problems like this, you want to square half the coefficient of x -- always half.
Answer:
Decagon
Step-by-step explanation:
We can use the general equation to determine the sum of interior angles:
Since we know the sum of interior angles (I.A.) is 1440°, we must figure out n - the number of sides and so:
Since n=10 this means that it is a 10 sided shape meaning it's a decagon.