anonymous
  • anonymous
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?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.
schrodinger
  • schrodinger
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anonymous
  • anonymous
|dw:1328469576570:dw|
anonymous
  • anonymous
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
anonymous
  • anonymous
I used the quadratic formula after and got x= -12+/-√29/2 but it's wrooong

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anonymous
  • anonymous
The answer is supposed to be: 0.5 m
anonymous
  • anonymous
|dw:1328481863682:dw|
anonymous
  • anonymous
7x+5x+x^2=6.25 try this one..
anonymous
  • anonymous
Why is it 7x + 5x + x^2?
anonymous
  • anonymous
http://www.wolframalpha.com/input/?i=x^2%2B12x-6.25+%3D+0
anonymous
  • anonymous
area
anonymous
  • anonymous
|dw:1328482080435:dw|
anonymous
  • anonymous
But why isn't it not x^2 + 12x + 35?
anonymous
  • anonymous
or for the same result (7+x)(5+x)-35=6.25
anonymous
  • anonymous
I am so confused..
anonymous
  • anonymous
|dw:1328482316536:dw|
anonymous
  • anonymous
okay, I get that part.
anonymous
  • anonymous
ok, we looking for shaded area right? large rec is (5+x)(7+x) small rec is 35
anonymous
  • anonymous
yes. ohhh..

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