Question

8) Calcule o valor de x em cada questão:
a) 2x + 10 = 50
d) 4x - 2x - 5 = x + 15
b) 3x - 12 = 48
2x + 64
e) 3x + 2x - 12 + 6 = -
c) 2x + x - 10 = 80
f) x + x - 2 = 38​

Answer 1

Resposta:

a)2x+10=50

2x=50-10

2x=40

40

x= __

2

x= 20.

b)4x-2x-5=x+15

4x-2x-x=15+5

2x-x=15+5

x=20

c)3x-12=48

3x=48+12

3x=60

60

x= __

3

x=20.

d)2x+64

2x=-64

-64

x= ___

2

x=32.

e) não tem como pois vai dar número decimal

f)2x+x-10=80

2x+x=80+10

3x=90

90

x= ___

3

x=30.

g)x+x-2=38

x+x=38+2

2x=40

40

x= __

2

x=20.

Answer 2

Resposta:

a) 2x+10=50

2x=50-10

2x=40

x=40/2

x=20

b)

$3x-12=48\\3x=48+12\\3x=60\\x=\frac{60}{3}\\x=20$

c)

$2x+x-10=80\\3x=80+10\\3x=90\\x=\frac{90}{3}\\x=30$

d)

$4x-2x-5=x+15\\4x-2x-x=15+5\\4x-3x=20\\x=20$

e)

$3x+2x-12+6=-2x+64\\3x+2x+2x=64+12-6\\7x=70\\x=\frac{70}{7}\\x=10$

f)

$x+x-2=38\\2x=38+2\\2x=40\\x=\frac{40}{2}\\x=20$