Question

teorema de tales , encontre o valor de x
x = 9
x+2 = 12

Answer 1

veja...

$\frac{x}{x+2} = \frac{9}{12} \\ \\ 12x=9(x+2) \\ \\ 12x=9x+18 \\ \\ 12x-9x=18 \\ \\ 3x=18 \\ \\ x=18\div3 \\ \\ x=6$