anonymous
  • anonymous
Trapezoid problem? (Geometry)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
I set up the equation as 3x+5=1/2[(7x+4)+4] but I got the wrong answer. I dont understand how to do it, please help?
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sirm3d
  • sirm3d
what value of x did you get?
anonymous
  • anonymous
I got 10, but the answer is 11. I dont know how to get 11 though..

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sirm3d
  • sirm3d
ah, \(\overline{EF}\) is asked. what did you get for x?
anonymous
  • anonymous
I told you haha, I got 10...
sirm3d
  • sirm3d
something went wrong in your algebra. let's compare results. \[3x+5=(1/2)[(7x+4)+4]\\2(3x+5)=(7x+4)+4\\6x+10=7x+8\]
anonymous
  • anonymous
Where did you get the 2 from? And where did the 1/2 go?
sirm3d
  • sirm3d
i multiplied the first equation by 2 to clear denominator
anonymous
  • anonymous
That would've been better...but if you solve it like that wouldnt x=6?
sirm3d
  • sirm3d
6x+10-6x=7x+8-6x 10 = x + 8 10-8=x-8 2=x
sirm3d
  • sirm3d
\[\overline{EF}=3x+5=3(2)+5=11\]
sirm3d
  • sirm3d
uhm, the third line should read 10-8=x+8-8
anonymous
  • anonymous
Oh I see...but I thought Line EF was half of line BC...?

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