Question

1)Resolva as seguintes equações:

a) 7(x - 5) = 3 (x + 1)
b) 3 ( x - 2 ) = 4 (-x + 3)
c) 2 (x +1) - (x -1) = 0
d) 5(x + 1) -3 (x +2) = 0
e) 13 + 4(2x -1) = 5 (x +2)
f) 4(x + 5) + 3 (x +5)= 21
g) 2 (x +5 ) - 3 (5 - x) =10
h) 8 ( x -1) = 8 -4(2x - 3)

Answer 1

Resposta:

a ) 7(x -5) = 3( x +1)

7x -35 = 3x +3

7x -3x = +13 +35

4x =×48

x= 48/4

x= 12

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

3x -6 = -4x +12

3x + 4x = +12 +6

7x = 18

x= 187

c ) 2x ( c + 1 ) -(x -1) = 0

2x + 2 -x+1 =0

2x +2 -x +1 <0

+x +3 =0

x = 3

d) 5 (x + 1) -3 (x+ 2)= 0

5x + 5 -3x -6= 0

5x -3x = -5

2x = 5

x = 5/2

e) 13 +4(2x -1) = 5(x + 2)

13 +8x -4 = 5x +10

8x -5x = + 10-4 -13

3x = -7

x = -7/3

f) 4(x+5) +3( x +5) = 21

4x +20+3x +15 =21

4x +3x = +21-20+16

7x = 16

x= 16/7

g ) 2(x +5) -3 (5-x)= 10

2x +10 -15 +3x=10

2x +3x =10-10!15

5x = -15

x= -15/5

x= -3

h) 8(x -1) = 8 -4(2x-3)

8x -8 = 8 -8x -12

8x 8x = 8 - 12 +8

16x = 12

x= 12/16

x = 3/4

Answer 2

Resposta:

a)

7(x-5)=3(x+1)

7x-35 = 3x+3

7x-3x=3+35

4x=38 x=9,5

b)

3x-3 = -4x+12

3x+4x = 12+3

7x=15 x=15/7 x= 2,14

c) X = 3

d) 5x+5 -3x-6 = 0

2x= 0 +6 -5

2x = 1

x=1/2 x= 0,5

e) 13+ 8x- 4 = 5x+10

8x-5x = 10 +9

3x = 19 x=19/3 x=6,33

f) 4x+20 +3x +15 = 21

7x = 21 -35 =

7x = -14 .(-1)

x = 14/7 x= 2

g) 2x + 10 - 15 +3x = 10

5x = 10 + 15 -10

5x = 15 x=15/5 x= 3

h) 8x-8 = 8-8x + 12

8x+8x = 20 + 8

16x = 28 x=28/16 x= 1,75

Explicação passo-a-passo: