kiyomi1 kiyomi1

12-09-2017
Mathematics

contestada

please help me with this math question i'm not good at math and i don't understand this well

please help me with this math question im not good at math and i dont understand this well class=

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musiclover10045 musiclover10045

12-09-2017

9/2x+4 = 6/x+4

9x+36 = 12x+24

3x=12

x = 4

4+4 = 8

ED = 8

Answer Link

12-09-2017

Hello,

Using Thalès,

AE/ED=AB/DC

(2x+4)/(x+4)=9/6
(2x+4)/(x+4)=3/2
(2x+4)*2=(x+4)*3
4x+8=3x+12
x=4
==>x+4=ED=4+4=8

Answer Link

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