Question

02. Calcule a raiz das equações do primeiro grau.
a) 5x + 2 = 12
b)-3(x + 1) = 2 (x + 4)
c) (x - 1) = -(x + 1)​

Answer 1

Resposta:

a) 5x + 2 = 12

5x = 12 - 2

5x = 10

x = 10/5

x = 2

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

-3x -3 = 2x + 8

-3x -2x = 8 + 3

-5x = 11

x = 11/-5

x= -2,2

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

x - 1 = - x - 1

x + x = - 1 + 1

2x = 0

x = 0