You mean "4x", not "4c" but the problem appears to be that you do not know how to "complete the square".

**Why** did you add "1" and "4"?

A "perfect square" is of the form

. Compare that to

. Where you have "4x", the general formula has "2ax". Okay, for those to be the same, you must have 4= 2a. What is "a"? What is "

"?

**That's** what you want to add to both sides of the equation.

You have the same problem with the y term.

(Not 6t. You seem awfully careless with what you write!)

Now compare

and

. You must have 2a= 6 so what is a? What is

? That is what you want to add, not "4".