(-x-14)^2 = x^2 +14x+14x+196
which turns into x^2+28x+196.
hope this helps
and give thanks
You combine both 2x-12 and x+2 and 11 which makes the equation
2x-12+x+2= 11
The you get your answer which is
X=7
The vertex form:

The axis of symetry is x = h.

We have

Substitute:

<h3>Answer: x = -3</h3>