Which of the following constants can be added to x^2 + 2/3x to form a perfect square trinomial?

 is to be added to make  a perfect square trinomial as

Step-by-step explanation:

Given :  

We have to find what can be added to   to form a perfect square trinomial.

Perfect square trinomial is of the form

Consider the given expression

Using algebraic identity ,

Comparing , we get,  a = x ......(1)

Uisng (1) , we get,

To make it  a perfect square trinomial we need to add term

Thus,  is to be added to make  a perfect square trinomial as

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