Wilson cuts rectangular mats for picture frames. The area of the mat before it is cut is represented by the function
M(x) = 3.6x² +14.2x + 14. The area thatis cut out and removed from the middle of the mat is represented by the function
N(x) = x + 5X.
If x is the width of the portion of the mat that is cut out, which function best describes A(x), the area of the cut mat?