anonymous
  • anonymous
The perimeter of a rectangle field is 60 meters. Its area is 200 square meters. Find its dimensions.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Please explain each step. I am having trouble here. :(
anonymous
  • anonymous
come on guys there has to be at least one nerd here. lol
nenadmatematika
  • nenadmatematika
|dw:1340060211664:dw|

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nenadmatematika
  • nenadmatematika
so you'll have to solve this system. From the second equation b=30-a so plug it back into the first equation and you'll get this equation:|dw:1340060339958:dw|
nenadmatematika
  • nenadmatematika
so your rectangle field has sides a=10 b=20 or a=20 b=10
nenadmatematika
  • nenadmatematika
do you understand this?
anonymous
  • anonymous
ah so its that parenthese trick thing again where you multiply them and it equal a complicated equation? I think i get it
nenadmatematika
  • nenadmatematika
haha :D OK...you can think of it in that way...the basics are to know the formulas for area and perimeter of rectangle...then just to combine those two...I hope I helped you :D
anonymous
  • anonymous
the only part i dont get is why you changed the 60 to 30
nenadmatematika
  • nenadmatematika
formula for the perimeter is 2(a+b) where a and b are lengths of sides...you have its value 60...so a+b=60/2=30...get it? :D
anonymous
  • anonymous
ok got that ok what about the term you added after that?
nenadmatematika
  • nenadmatematika
a+b=30, so you can express one side by using the other side,so a=30-b....that's the connection between those two sides...so I plugged back 30-b instead of a in the first equation...that's how I got the quadratic equation which gives you the exact solution....
anonymous
  • anonymous
hmmm, I still don't get why you added the term -a^2
nenadmatematika
  • nenadmatematika
how would you multiply a*(30-a)?
anonymous
  • anonymous
why would you multiplay it by a? a^2 - 30a
anonymous
  • anonymous
there must be something im missing cause i kinda get you...

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