5 Wilson cuts rectangular mats for picture frames. The area of the mat before it is cut is represented by the function
M(x) = 4.2x2 +17.4x + 18. The area that is cut out and removed from the middle of the mat is represented by the function
N(x) = x2 + 7x.
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?
OA. A(x) = 4.1x2 + 17.4x + 11
OB. A(x) = 4.2x2 + 16.4x + 11
OC. A(x) = 5.2x2 + 24.4x + 18
OD. A(x) = 3.2x2 + 10.4x + 18
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