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michelle_1216_16

  • one year ago

Kody is building a table. He attached planks of wood and now wants to build a border around the planks. The area of the entire table should be no larger than 3,276 square inches. All together, the planks are 36 inches wide and 72 inches long. Which quadratic equation represents the area of the planks and border combined? (The border must have equal width on each side.) 4x2 + 216x + 2,592 = 0 4x2 + 216x − 684 = 0 2x2 + 216x − 3,276 = 0 x2 + 108x + 3,276 = 0

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  1. skullpatrol
    • one year ago
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    |dw:1372971833241:dw|

  2. michelle_1216_16
    • one year ago
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    so what next do I use that and incorrperate it into the equation to get the answer

  3. skullpatrol
    • one year ago
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    $$(2x+72)(2x+36)=3276$$ This is the equation for the area of the table. You need to now multiply it out and try to match it to one of the choices.

  4. michelle_1216_16
    • one year ago
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    oh thanks

  5. skullpatrol
    • one year ago
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    Thanks for trying :)

  6. michelle_1216_16
    • one year ago
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    so it would be A

  7. skullpatrol
    • one year ago
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    I get $$4x^2 + 216x − 684 = 0$$

  8. michelle_1216_16
    • one year ago
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    but when you multiply 36 by 72 you get 2592

  9. michelle_1216_16
    • one year ago
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    so the first two are correct but the last dosn't seem so

  10. michelle_1216_16
    • one year ago
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    and the answer is suppose to be positive

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