Centerville is the headquarters of Greedy Cablevision Inc. The cable company is about to expand service to two nearby towns, Springfield and Shelbyville. There needs to be cable connecting Centerville to both towns. The idea is to save on the cost of cable by arranging the cable in a Y-shaped configuation. Centerville is located at (12, 0) in the zy-plane, Springfield is at (0, 9), and Shelbyville is at (0, -9). The cable runs from Centerville to some point (x, 0) on the z-axis where it splits into two branches going to Springfield and Shelbyville. Find the location (x, 0) that will minimize the amount of cable between the 3 towns and compute the amount of cable needed. Justify your answer. To solve this problem we need to minimize the following function of x: f(x) = We find that f(x) has a critical number at x = To verify that f(x) has a minimum at this critical number we compute the second derivative f''(x) and find that its value at the critical number is Thus the minimum length of cable needed is ubmit Question a positive number. .

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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● Question 9
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Centerville is the headquarters of Greedy Cablevision Inc. The cable company is about to expand service to
two nearby towns, Springfield and Shelbyville. There needs to be cable connecting Centerville to both towns.
The idea is to save on the cost of cable by arranging the cable in a Y-shaped configuation.
Centerville is located at (12, 0) in the ay-plane, Springfield is at (0, 9), and Shelbyville is at (0, -9). The
cable runs from Centerville to some point (a, 0) on the z-axis where it splits into two branches going to
Springfield and Shelbyville. Find the location (x, 0) that will minimize the amount of cable between the 3
towns and compute the amount of cable needed. Justify your answer.
To solve this problem we need to minimize the following function of x:
f(x) =
@
T
We find that f(x) has a critical number at x =
To verify that f(x) has a minimum at this critical number we compute the second derivative f''(x) and find
that its value at the critical number is
, a positive number.
Thus the minimum length of cable needed is
2
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9
Transcribed Image Text:1 ● Question 9 Textbook Centerville is the headquarters of Greedy Cablevision Inc. The cable company is about to expand service to two nearby towns, Springfield and Shelbyville. There needs to be cable connecting Centerville to both towns. The idea is to save on the cost of cable by arranging the cable in a Y-shaped configuation. Centerville is located at (12, 0) in the ay-plane, Springfield is at (0, 9), and Shelbyville is at (0, -9). The cable runs from Centerville to some point (a, 0) on the z-axis where it splits into two branches going to Springfield and Shelbyville. Find the location (x, 0) that will minimize the amount of cable between the 3 towns and compute the amount of cable needed. Justify your answer. To solve this problem we need to minimize the following function of x: f(x) = @ T We find that f(x) has a critical number at x = To verify that f(x) has a minimum at this critical number we compute the second derivative f''(x) and find that its value at the critical number is , a positive number. Thus the minimum length of cable needed is 2 < > Submit Question Jump to Answer W @ Videos [+] # 3 E $ 4 R % 5 T ^ 6 Y & 7 U 8 9
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