question_answer

What must be added to the following expression to make it a perfect square? \[\frac{3{{x}^{2}}}{16}+\frac{23}{9}-\frac{\sqrt{78}x}{3}\]

A)  \[\frac{1}{3}\]                         

B)  \[\frac{13}{9}\]

C)  \[8\]                            

D)  \[9\]

E)  None of these