question_answer

If x = y = z, then find the value of\[{{x}^{2}}+{{y}^{2}}+{{z}^{2}}+2xy\]?

A) \[5{{x}^{2}}\]            

B) \[5{{y}^{2}}\]

C) \[5{{z}^{2}}\]             

D) All of these

E) None of these