Question

3.(x - 1) - 2. (x + 4) = 10

Answer 1

Resposta:

21

Explicação passo-a-passo:

Expand the following:

3 (x - 1) - 2 (x + 4) = 10

3 (x - 1) = 3 x - 3:

3 x - 3 - 2 (x + 4) = 10

-2 (x + 4) = -2×4 - 2 x:

3 x + -8 - 2 x - 3 = 10

-2×4 = -8:

3 x - 2 x + -8 - 3 = 10

Grouping like terms, 3 x - 2 x - 8 - 3 = (3 x - 2 x) + (-3 - 8):

(3 x - 2 x) + (-3 - 8) = 10

3 x - 2 x = 1 x:

1 x + (-3 - 8) = 10

-3 - 8 = -11:

1 x + -11 = 10

Add 11 to both sides:

1 x + (-11 + 11) = 11 + 10

11 - 11 = 0:

1 x = 10 + 11

10 + 11 = 21:

1 x = 21

Multiply both sides of 1 x = 21 by 1:

1×1 x = 1×21

1×1 = 1^2:

1^2 x = 1×21

1^2 = 1:

1 x = 1×21

1×21 = 21:

Answer: |

| x = 21