Question

Determine o valor de x: 12(x + 1) + 8(2x – 3) = 20 (x – 1 ) + 32
a 3
b 6
c 9
d 12

Answer 1

Resposta:

Letra A

Explicação passo-a-passo:

12(x + 1) + 8(2x – 3) = 20 (x – 1 ) + 32

12x + 12 + 16x - 24 = 20x - 20 + 32

12x + 16x + 12 - 24 = 20x - 20 + 32

12x + 16x - 20x =  - 20 + 32 - 12 + 24

8x = 24

x = 24 : 8

x = 3

Verificando:

12(3 + 1) + 8(2. 3 – 3) =

12 . 4 + 8 . (6 - 3) =

48 + 48 - 24 =

96 - 24 =

72

20 (3 – 1 ) + 32 =

60 - 20 + 32 =

40 + 32 =

72

Answer 2

Resposta:

A

x = 3

Explicação passo-a-passo:

12(x + 1) + 8(2x – 3) = 20 (x – 1 ) + 32

12x + 12 + 16x - 24 = 20x - 20 + 32

12x + 16x - 20x = 32 + 24 - 12 - 20

8x = 24

x = 3