Question

podem me ajudar nessa por favor​

Answer 1

Resposta:

c) 14,5; d) 2,333...; e) 0,375; f) -2; g) 0,2; h) 6,666...

Explicação passo a passo:

c) 7(x - 2) = 5(x + 3)

7x - 14 = 5x + 15

7x - 5x = 15 + 14

2x = 29

x = 29 : 2

x = 14,5.

d) 2(x  - 5) + 4(x - 1) = 0

2x - 10 + 4x - 4 = 0

2x + 4x = 10 + 4

6x = 14

x = 14 : 6

x = 2,333...

e) 3(2x - 1) = - 2(x + 3)

6x - 3 = - 2x - 6

6x + 2x = - 6 + 3

8x = - 3

x = - 3 : 8

x = - 0,375.

f) 7(x - 1) - 2(x - 5) = x - 5

7x - 7 - 2x + 10 = x - 5

7x - 2x - x = - 5 + 7 - 10

7x - 3x = - 15 + 7

4x = - 8

x = (- 8) : 4

x = - 2.

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

8x + 4 = -2x + 6

8x + 2x = 6 - 4

10x = 2

x = 2 : 10

x = 0,2.

h) (x + 10) + 2(x + 5) = 0

x + 10 + 2x + 10 = 0

x + 2x = - 10 - 10

3x = - 20

x = - 20 : 3

x = 6.666...