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anonymous

  • 4 years ago

A rectangular lawn measures 7m by 5m. A uniform border of flowers is to be planted along two adjacent sides of the lawn, as shown in the diagram. If the flowers that have been purchased will cover an area of 6.25 m^2, how wide is the border?

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  1. anonymous
    • 4 years ago
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    |dw:1328469576570:dw|

  2. anonymous
    • 4 years ago
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    Width of the strip be x metres. Solve an equation to find x. Dimensions of the new lawn are (7+x) by (5+x) Area of the new lawn is 6.25m^2 (7+x)(5+x) = 6.25 35 + 12x + x^2 = 6.25 x^2 + 12x+28.75 = 0 a = 1, b=12, c=28.75

  3. anonymous
    • 4 years ago
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    I used the quadratic formula after and got x= -12+/-√29/2 but it's wrooong

  4. anonymous
    • 4 years ago
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    The answer is supposed to be: 0.5 m

  5. anonymous
    • 4 years ago
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    |dw:1328481863682:dw|

  6. anonymous
    • 4 years ago
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    7x+5x+x^2=6.25 try this one..

  7. anonymous
    • 4 years ago
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    Why is it 7x + 5x + x^2?

  8. anonymous
    • 4 years ago
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    http://www.wolframalpha.com/input/?i=x^2%2B12x-6.25+%3D+0

  9. anonymous
    • 4 years ago
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    area

  10. anonymous
    • 4 years ago
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    |dw:1328482080435:dw|

  11. anonymous
    • 4 years ago
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    But why isn't it not x^2 + 12x + 35?

  12. anonymous
    • 4 years ago
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    or for the same result (7+x)(5+x)-35=6.25

  13. anonymous
    • 4 years ago
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    I am so confused..

  14. anonymous
    • 4 years ago
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    |dw:1328482316536:dw|