Another way to write (3x-4)^2?

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

How do i make someone brainliest? (if you answer me, i might be able to make you brainliest! )

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?