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3.7 Optimization Problems

3.7 Optimization Problems. Ex. 1 A manufacturer wants to design an open box having a square base and a surface area of 108 in 2 . What dimensions will produce a box with maximum volume?. Since the box has a square base, its volume is V = x 2 h. h. Note: We call this the primary

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3.7 Optimization Problems

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  1. 3.7 Optimization Problems

  2. Ex. 1 A manufacturer wants to design an open box having a square base and a surface area of 108 in2. What dimensions will produce a box with maximum volume? Since the box has a square base, its volume is V = x2h h Note: We call this the primary equation because it gives a formula for the quantity we wish to optimize. x x The surface area = the area of the base + the area of the 4 sides. S.A. = x2 + 4xh = 108 We want to maximize the volume, so express it as a function of just one variable. To do this, solve x2 + 4xh = 108 for h.

  3. Substitute this into the Volume equation. To maximize V we find the derivative and it’s C.N.’s. 3x2 = 108 We can conclude that V is a maximum when x = 6 and the dimensions of the box are 6 in. x 6 in. x 3 in.

  4. Procedures for solving Applied Minimum and Maximum Problems • Assign symbols to all given quantities and quantities • to be determined. • Write a primary equation for the quantity to be • maximized or minimized. • Reduce the primary equation to one having a single • independent variable. This may involve the use of • secondary equation. • Determine the domain. Make sure it makes sense. • Determine the max or min by differentiation.

  5. Find the points on the graph of y = 4 – x2 that are closest to the point (0,2). What is the distance from the point (x,y) and (0,2)? 4 3 2 1 (x,y) (x,y) We want this dist. to be minimized.

  6. = 2x(2x2 – 3) = 0 C.N.’s imaginary 0 dec. dec. inc. inc. 1st der. test minimum minimum Two closest points.

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