AP Calculus
You are desigining a rectangular poster to contain 256 in^2 of printing with 3 in. margin at the top and bottom and a 2-in. margin at each side. What is the overall dimensions will minimize the amount of paper used?(round to the nearest whole number)
A. 13 in by 20 in
B. 15 in by 23 in
C. 17 in by 26 in
D. 19 in by 23 in
E. 20 in by 22 in
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*we are given that the printed area is

Would I take the the derivative of A(x) or A?

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