anonymous
  • anonymous
A rectangular flower garden with dimensions 3m by 7m is surrounded by the walk of uniform width. If the are of the walk is 11 sq. m, what is the width in meters?
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
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anonymous
  • anonymous
Do you know where to go from here?
anonymous
  • anonymous
Not really..

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anonymous
  • anonymous
Do you mind if I continue?
anonymous
  • anonymous
Not at all.
anonymous
  • anonymous
|dw:1358847340760:dw|
anonymous
  • anonymous
Do you think you can solve that equation?
anonymous
  • anonymous
Not sure.. I could but it would take me a while and i wouldn't be to confident of my answer.
anonymous
  • anonymous
(7+2x)(3 +2x)-11=21---> 4x^2+20x-11=0----> now solve this using the quad. equation. x=-5.5 and x=.5 The value can only be positive therefore the width can only be x=.5 So the width around the garden is 1/2 m or .5m. Whichever method your prefer.
anonymous
  • anonymous
Does that help?
anonymous
  • anonymous
Yes it does, thank you!
anonymous
  • anonymous
You're welcome!

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