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eroshea Group Title

a piece of cardboard has an area of 486 cm^2. a square of side 3cm is cut from each corner and an open box is made by turning up the ends and sides if the volume of the box formed is 756cm^3. what are the dimensions of the cardboard?

  • 2 years ago
  • 2 years ago

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  1. hartnn Group Title
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    drawing a figure will help, could u draw a figure of this ?

    • 2 years ago
  2. eroshea Group Title
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    |dw:1353637103770:dw|

    • 2 years ago
  3. hartnn Group Title
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    |dw:1353579949506:dw|

    • 2 years ago
  4. hartnn Group Title
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    volume = 3(x-6)(y-6) = 756

    • 2 years ago
  5. hartnn Group Title
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    can u solve those 2 equations ? xy=486 3(x-6)(y-6) = 756 ?

    • 2 years ago
  6. eroshea Group Title
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    cAN I DO the substitution method?

    • 2 years ago
  7. eroshea Group Title
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    x = 486/y then substitute to the second equation

    • 2 years ago
  8. hartnn Group Title
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    try it, if u go wrong, i'll help.... instead substitute xy=486 in 2nd equation

    • 2 years ago
  9. hartnn Group Title
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    u get xy term in 2nd equation

    • 2 years ago
  10. hartnn Group Title
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    and u'll be able to find x+y from 2nd equation...

    • 2 years ago
  11. eroshea Group Title
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    18y^2-810y+8748 very big numbers >.<

    • 2 years ago
  12. hartnn Group Title
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    y^2-45y+486

    • 2 years ago
  13. hartnn Group Title
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    if 18y^2-810y+8748 is correct... i have not checked that.

    • 2 years ago
  14. hartnn Group Title
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    y^2-45y+486 =0 is correct can u factor it ?

    • 2 years ago
  15. hartnn Group Title
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    hint : 18*27 = 486

    • 2 years ago
  16. hartnn Group Title
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    y^2-45y+486 =0 (y-18)(y-27)=0

    • 2 years ago
  17. hartnn Group Title
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    find y from here, then u also get 2 values of x then dimensions are x,y

    • 2 years ago
  18. eroshea Group Title
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    you're a very big help to me my friend. thanks a lot :)

    • 2 years ago
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