Question

1) Resolva as equações:

a) 3 (x + 1) = 2 (x + 4)

b) 2 (x + 1) = (x + 2)

c) 4 (x + 5) = 2 (x + 3)

d) x + 5 = 25

e) 2x + 4 = x + 9

f) 5x + 2x = 21

g) 3x – x = 14 - 2

h) x + 9 = 16

i) 2x – 4 = 3

j) 4x + 8 = 2x + 18

k) 2x + 3x = 20 – 5

l) x + 2x = 19 - 1​

Answer 1

Resposta:

a) 3 ( x + 1 ) = 2 ( x + 4 )

3x + 3 = 2x + 8

3x - 2x = 8 - 3

x = 5

b) 2 ( x + 1 ) = ( x + 2 )

2x + 2 = x + 2

2x - x = 2 - 2

x = 0

c) 4 ( x + 5 ) = 2 ( x + 3 )

4x + 20 = 2x + 6

4x - 2x = 6 - 20

2x = - 14

x = -14/2

x = - 7

d) x + 5 = 25

x = 25 - 5

x = 20

e) 2x + 4 = x + 9

2x - x = 9 - 4

x = 5

f) 5x + 2x = 21

7x = 21

x = 21/7

x = 3

g) 3x – x = 14 - 2

2x = 12

x = 12/2

x = 6

h) x + 9 = 16

x = 16 - 9

x = 7

i) 2x – 4 = 3

2x = 3 + 4

2x = 7

x = 7/2

x = 3,5

j) 4x + 8 = 2x + 18

4x - 2x = 18 - 8

2x = 10

x = 10/2

x = 5

k) 2x + 3x = 20 – 5

5x = 15

x = 15/5

x = 3

l) x + 2x = 19 - 1

3x = 18

x = 18/3

x = 6

Espero ter ajudado