Question

Aplicando o teorema de Tales, o valor de X é:

a)6

b)12

c)3

d)18​

Answer 1

$\frac{x}{ x+ 2} = \frac{9}{12} \\ 12x = 9(x + 2) \\ 12x = 9x + 18 \\ 12x - 9x = 18 \\ 3x = 18 \\ x = \frac{18}{3} \\ x = 6$