Question

1 - Resolva as equações, sendo U = Q
a) 3 - 7 = 2x + 5
b) 7x + 8 = 4x – 10
c) 4x – 15 = -2x + 3
d) 2x - 4 - 8 = 4x
e) 3x = x + 1 +7
f) 2x + 5 - 5x = -1
g) 7x - 4 - x = -2x + 8 - 3x
h) 6 + 6x = 5x + 2
i) 3x - 2 - 2x - 3 = 0
j) 5x -5 + x = 9+ x

Answer 1

Resposta:

Explicação passo-a-passo:

isolando o x, temos:

a) 3 - 7 = 2x + 5 -> 3 - 7 - 5 = 2x -> -9/2 ou - 4,5

b) 7x + 8 = 4x – 10 -> 7x - 4x = -10 - 8 -> 3x = - 18 -> x = -18 / 3 = -6

c) 4x – 15 = -2x + 3 -> 4x + 2x = +3 +15 -> 6x = 18 -> x = 18/6 = 3

d) 2x - 4 - 8 = 4x -> - 4 - 8 = 4x - 2x -> -12 = 2x -> x = -12/2 = -6

e) 3x = x + 1 +7 -> 3x - x = +1 +7 -> 2x = 8 -> x = 8/2 -> 4

f) 2x + 5 - 5x = -1 -> 2x - 5x = -1 -5 -> -3x = -6 -> x = -6/-3 = 2

g) 7x - 4 - x = -2x + 8 - 3x -> 7x - x + 2x +3x = 8 +4 -> 11x = 12 -> x = 12/11 ou 1,09

h) 6 + 6x = 5x + 2 -> 6x - 5x = 2 - 6 ->  x = -4

i) 3x - 2 - 2x - 3 = 0 -> 3x - 2x = 3 +2 -> x = 5

j) 5x -5 + x = 9+ x -> 5x + x - x = 9 +5 -> 5x = 14 -> x = 14/5 ou 2,8