Question

Encontre a raiz de cada equação abaixo:

a) 9x - 2 = 4x + 18

b) 2x - 10 + 7x + 10 = 180

c) 5x - 91 = 4x -77

d) 2(x + 5) - 4= 26

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

f) 3(x + 1) +2 =5 + 2 (x - 1)

g) 3(x + 1) +2( 2x - 3) =5( x - 1) +8

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

i) 2(x -3) + 8x +4 =5 (x+2)

j) 3(3x +8) - 5x = x - 3

Answer 1

Resposta:

a) 9x - 2 = 4x + 18

>9x-4x=18+2

>5x=16

x=16/5

b) 2x - 10 + 7x + 10 = 180

> 2x+7x=180-10+10

>9x=180

x=20

c) 5x - 91 = 4x -77

>5x-4x=91-77

x=14

d) 2(x + 5) - 4= 26

>2x+10-4=26

>2x=26-6

2x=20

x=20/2

x=10

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

8x-4=3x+6

8x-3x=6+4

5x=10

x10/5

x=2

f) 3(x + 1) +2 =5 + 2 (x - 1)

3x+3+2=5+2x-2

3x-2x=5-2-3-2

x=-2

g) 3(x + 1) +2( 2x - 3) =5( x - 1) +8

3x+3+4x-6=5x-5+8

7x-5x=3-3+6

2x=6

x6/2

x=3

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

2x-2+3x+3=4x+8

5x+1=4x+8

5x-4x=8-1

x=7

i) 2(x -3) + 8x +4 =5 (x+2)

2x-6+8x+4=5x+10

10x-5x=10+6-4

5x=16-4

x=12/5

j) 3(3x +8) - 5x = x - 3

9x+24-5x=x-3

4x-1=-3-24

3x=-27

x=-9

Explicação passo a passo: