Answer:
x=-3
Step-by-step explanation:
I have a formula
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:
we cant see the answers or the photo i sadly cant help
Oh what u will do is add 2y+4x+7