Question

Stabiliti multimea solutiilor pentru fiecare ecuatie in parte:
a) 3x+8=14
b) 2x-3=x+2
c) 3x+2+x-6
d)4x+3=x-15
e) 3x-8=x+4
f)3x-11=x-23
g) 4x+5=2x+13
h) 5x-9=3x+1
i) 3x+11=-10
j) -7x+19=-16
k) 5(x+3)=-20
m) -6x+22=-20
n) -11x-91=30
0) 4x+15=-5
p) 8x=x=49
Va rog dau coroana

Answer 1

a) 3x + 8 = 14

3x = 14 - 8

3x = 6

x = 6 : 3

x = 2

S = {2}

b) 2x - 3 = x + 2

x - 3 = 2

x = 2 + 3

x = 5

S = {5}

c) 3x + 2 = x - 6

2x + 2 = -6

2x = -6 - 2

2x = -8

x = -8 : 2

x = -4

S = {-4}

e) 3x - 8 = x + 4

2x - 8 = 4

2x = 4 + 8

2x = 12

x = 12 : 2

x = 6

S = {6}

f) 3x - 11 = x - 23

2x - 11 = -23

2x = -23 + 11

2x = -12

x = -12 : 2

x = -6

S = {-6}

g) 4x + 5 = 2x + 13

2x + 5 = 13

2x = 13 - 5

2x = 8

x = 8 : 2

x = 4

S = {4}

h) 5x - 9 = 3x + 1

2x - 9 = 1

2x = 1 + 9

2x = 10

x = 10 : 2

x = 5

S = {5}

i) 3x + 11 = -10

3x = -10 - 11

3x = -21

x = -21 : 3

x = -7

S = {-7}

j) -7x + 19 = -16

-7x = -16 - 19

-7x = -35

7x = 35

x = 35 : 7

x = 5

S = {5}

k) 5(x + 3) = -20

5x + 15 = -20

5x = -20 - 15

5x = -35

x = -35 : 5

x = -7

S = {-7}

m) -6x + 22 = -20

-6x = -20 - 22

-6x = -42

6x = 42

x = 42 : 6

x = 7

S = {7}

n) -11x - 91 = 30

-11x = 30 + 91

-11x = 121

x = 121 : -11

x = -11

S = {-11}

o) 4x + 15 = -5

4x = -5 - 15

4x = -20

x = -20 : 4

x = -5

S = {-5}