Wilson cuts rectangular mats for picture frames. The area of the mat before it is cut is represented by the function M(x) = 4x2 + 22x + 30. 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?
A(x) = 4x2 + 21x + 23

A(x) = 3.9x2 + 22x + 23

A(x) = 3x2 + 15x + 30

A(x) = 5x2 + 29x + 30

Question

Wilson cuts rectangular mats for picture frames. The area of the mat before it is cut is represented by the function M(x) = 4x2 + 22x + 30. 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?
A(x) = 4x2 + 21x + 23

A(x) = 3.9x2 + 22x + 23

A(x) = 3x2 + 15x + 30

A(x) = 5x2 + 29x + 30

anonymous · Answer

one moment please.

olsolneo123 · Answer

ok

anonymous · Answer

is it 4 x 2 or 4x^2?

olsolneo123 · Answer

you know what. it doesnt even matter anymore. i will give you a medal and fan you just because you tried to help me. thank you.

michele_laino · Answer

I think you have to calculate the difference: M(x)-N(x)

anonymous · Answer

I want to help you, don't give up, I am here, now, I can try both if you would like?

anonymous · Answer

@Michele_Laino I was getting to that, but I had not known the operations to be performed at the moment.

olsolneo123 · Answer

Its ok hun. The program ended and when i pulled it back up, a different question came up. its fine. :)

anonymous · Answer

would you like help with that one then?

anonymous · Answer

@olsolneo123

olsolneo123 · Answer

nope. its ok. thank u