Question

Verifique se 2 e raiz das equacões abaixo.
a) 2x−4=0.
b) 3x+5=11.
c) 3x+6=2x+8.
d) 12/x=8.
e) x/4+3/2=2

Answer 1

Resposta:

a) 2x−4=0.

2x = 4

x =4/2 = 2.

b) 3x+5=11.

3x = 11 - 5

3x = 6

x =6/3 = 2.

c) 3x+6=2x+8.

3x - 2x = 8 -6

x = 2.

d) 12/x=8.

12 = x . 8

12 = 8x

x = 12/8 = 3/2

e) x/4+3/2=2

x + 6 = 4 . 2

x + 6 = 8

x = 2

Answer 2

Vamos là.

a)

2x - 4 = 0

2*2 - 4 = 0 (V)

b)

3x + 5 = 11

3*2 + 5 = 11 (V)

c)

3x + 6 = 2x + 8

3*2 + 6 = 2*2 + 8

6 + 6 = 4 + 8

12 = 12 (V)

d)

12/x = 8

12/2 = 6 (F)

e)

2/4 + 3/2 = 1/2 + 3/2 = 4/2 = 2 (V)