2x^2 + 2y^2 + 2xy I think
Answer:
i think its the third one correct me if im wrong 0:)
It would be D because in order to get rid of the fraction and the value of k you need to multiply -4 to the entire equation. Hope this helps love!
Answer: 
Step-by-step explanation:
See attached image, it's direct formula substitution.
Answer:
5/2
Step-by-step explanation: