Question

Nesta figura , DE// BC . Encontre a medida x

Answer 1

$\frac{3X}{2X} = \frac{18}{2X+4}$
$\frac{3}{2} = \frac{18}{2X+4}$
6X+12=36
6X=36-12
6X=24
X=$\frac{24}{6}$
X=4

Answer 2

Semelhança de triângulos:
18/3x= (4+ 2x)/2x
3x(4+2x)=18x2x
12x+12x²=36x
12x²=24x
12x=24
x=24/12
x=2