Posted by **Mike** on Saturday, November 12, 2011 at 4:45am.

Boxes are made by cutting 8cm squares from the corners of sheets of cardboard and then folding. The sheets of cardboard are 6cm lnbger than they are wide.

width of sheet= x

length of sheet = x+6

length of finished box = (x-10)

width of finished box = (x-16)

volume of the box = 8x^2-208x+1280cm^3

Find the dimensions of the sheet of cardboard needed to make a box with a volume of 1728cm^3.

- Maths - Algebra -
**Reiny**, Saturday, November 12, 2011 at 9:38am
so

8x^2 - 208x + 1280 = 1728

8x^2 - 208x - 448 = 0

x^2 - 26x - 56 = 0

(x-28)(x+2) = 0

x = 28 or x = -2, but x cannot be negative,

x = 28

**the box is 12 wide, 18 long and 8 high**

check: (12)(18)(8) = 1728

- Maths - Algebra -
**Anonymous**, Wednesday, November 28, 2012 at 7:45am
12444

- Maths - differetiate culculus -
**amos**, Saturday, September 13, 2014 at 11:10am
a square piece of metal 18cm in each side n made a box without a top,by cutting a square from each corner folding up d flaps to form d side.what size corner should b cut in order volume of d box as large as possible?

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