anonymous
  • anonymous
help http://prntscr.com/1l4tko http://prntscr.com/1l4ttt
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
how to find the second one?
anonymous
  • anonymous
The diagonals are in the middle of the triangle so its basically it is breaking it up in 4 equal peices.
anonymous
  • anonymous
pok

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anonymous
  • anonymous
ok
anonymous
  • anonymous
then
anonymous
  • anonymous
So if you are trying to find ac it would what half of it twice.
anonymous
  • anonymous
so (x+4)(x+4)
anonymous
  • anonymous
simplify?
anonymous
  • anonymous
Since you have the sum of the length of the diaganols you have to make an equation equal to 20.
anonymous
  • anonymous
(2x-3)(2x-3)+(x+4)(x+4)=20
anonymous
  • anonymous
You have to solve for x before moving on
anonymous
  • anonymous
is the answer 7?
anonymous
  • anonymous
Uh one sec still solving!
anonymous
  • anonymous
Plug it in to check!
anonymous
  • anonymous
I dont think thats it?
anonymous
  • anonymous
idk
anonymous
  • anonymous
i solve this for x (2x-3)(2x-3)+(x+4)(x+4)=20
anonymous
  • anonymous
You have to do the quadratic eqaution...
anonymous
  • anonymous
idk how to do quad
anonymous
  • anonymous
did you get 5x^2-4x+25=20 when you simplified?
anonymous
  • anonymous
yep
anonymous
  • anonymous
Okay you need quad to find x give me a minute and ill do it...
anonymous
  • anonymous
ok
anonymous
  • anonymous
Its an imaginary number...
anonymous
  • anonymous
Assuming the rhombus is ABCD and E is the intersection of the diagonals, then we know the diagonals perpendicularly bisect each other, so AE is half of one diagonal and BE is half the other diagonal. That allows us to solve for x: (x+4) + (2x-3) = 20/2 3x + 1 = 10 3x = 9 x = 3 and since BE = 2x - 3 = 3 is half of BD, BD = 2*3 = 6 (answer C).
anonymous
  • anonymous
Figured out the better way to solve it lol
anonymous
  • anonymous
thank you
anonymous
  • anonymous
DO you understand how i got there?
anonymous
  • anonymous
so BE is half and BD is the other half?
anonymous
  • anonymous
each is 3?
anonymous
  • anonymous
Wait!!! i messed up lol you plug the three in x+4 and multiply it by 2 because you are finding ac
anonymous
  • anonymous
For some reason i thought it was the other one. But it will be 14 in that case.
anonymous
  • anonymous
thanks

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