Answer:

6

Step-by-step explanation:

Here is the "trick"

To get the special product of binomial and trinomial, focus first on the binomial.

In this problem it is

Now, to get the trinomial needed to have a special product,

first square the first term if the binomial. Squaring 2x will give us .

Secondly, get the negative product of both terms of the binomial,

here we get which gives us -6x

And finally, square the last term of the binomial, squaring 3 gives us 9.

The trinomial need to have a special product is

The answer is A

I hope this trick will be helpful to you.