Question

Resolva as expressões abaixo :

a) -3=x+10 =

b) 0=x+12 =

c)7=x+8 =

d) x -39= -79 =

e) x -3 + -7

f) x + 28=11

g) 4=x-10

Answer 1

Resposta:

a) -3=x+10 =

$- 3 - x - 10 = 0 \\ - 13 - x = 0 \\ - x = 13 \times ( - 1) \\ x = - 13$

b) 0=x+12 =

$0 - x - 12 = 0 \\ - x - 12 = 0 \\ - x = 12 \times ( - 1) \\ x = - 12$

c)7=x+8

$7 - x - 8 = 0 \\ - 1 - x = 0 \\ - x = 1 \times ( - 1) \\ x = - 1$

d) x -39= -79 =

$x - 39 + 79 = 0 \\ x + 4 0 = 0 \\ x = - 40$

e) x -3 + -7

$x - 3 = - 7 \\ x - 3 + 7 = 0 \\ x + 4 = 0 \\ x = - 4$

f) x + 28=11

$x + 28 - 11 = 0 \\ x + 17 = 0 \\ x = - 17$

g) 4=x-10

$4 - x + 10 = 0 \\ 14 - x = 0 \\ - x = - 14 \times ( - 1) \\ x = 14$