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AAHS M5S3L5 3 Teacher Graded Assignment PROJECTGUIDE 1

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AAHS M5S3L5 3 Teacher Graded Assignment PROJECTGUIDE 1
Assignment: Factor a Sum of Cubes
Follow the directions to find the missing information in each problem. Be sure to show all work leading to your answers and simplify your answers whenever possible.
1. A shipping company offers various sized shipping boxes to its customers. Some of these boxes are cube-shaped, with equal height, width, and depth. As part of an upcoming sales promotion, the company will offer two cube-shaped boxes for the price of one.
a. Write an expression to represent the total volume of two different sized boxes as a sum of cubes if one of the boxes has sides with a length of 1 foot and the other has sides with a length of x feet.
(1^3 + x^3) = (1 + 3)(1^2 - 1x + x^2) = 0

b. Factor the sum of cubes.
(a^3 + b^3 = (a + b) (a^2 - ab = b^2)

c.

Calculate the total volume of the two boxes if x = 3 feet.
(1^3 + x^3) = (1 + 3)(1^2 - 1x + x^2) = 7

2. A toy manufacturer is preparing to manufacture a puzzle cube in two different sizes. One of the puzzle cubes will have a side length of 4 centimeters, and the size of the other is yet to be determined.
a. Write an expression to represent the total volume of two different sized puzzle cubes as a sum of cubes, using m centimeters as the side lengths of the second puzzle. m^2 + 4^3

b. Factor the sum of cubes.
(m + 4) (m^2 - 2m + 4) (m + 5)

c.

Calculate the total volume of the two puzzle cubes if m = 5 centimeters.
(m + 4) (m^2 - 2m + 4) (m + 5) = 21

© K12 Inc.

3. A pet supply store is planning to offer cube-shaped fish tanks. The store manager decides to order one tank with a 12-inch side length but has not yet decided on the size of the other.
a. Write an expression to represent the total volume of two different sized tanks as a sum of cubes, using 2t centimeters as the length of the sides in the second tank.
(12)^3 + (2t)^3 = 2t^2 + 1730 cm^3

b. Factor the sum of cubes.
(2t + 12^3) (2 x 7 - 2t + 12^2)

c.

Calculate the total volume of the two fish tanks if t = 7 inches.
1,274 cm

4. Think of

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