Answer:
its the 3rd one
Step-by-step explanation:
Perfect-square trinomials are of the form:

and are expressed in squared-binomial form as: 
The only possible choice for squared-binomial form is

Answer: correct choice is A.
5.00 i think is the right way
Answer:
1st is valid 2nd is not valid
Step-by-step explanation:
I believe its b hope this helped