Question

2. Resolva as equações:
a) 4 (x + 1)= 12
b) 3. (3-X) - 4x = 18
c) 9x - 3(2x + 2) = 15
d) 6x + 4 = 2 x - 8​

Answer 1

Resposta:

A) 4(x + 1) = 12

   4x + 4 = 12

   4x = 12 - 4

   4x = 8

     x = 8/4

     x = 2

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B) 3(3 - x) - 4x = 18

   9 - 3x - 4x = 18

   -7x = 18 - 9

   -7x = 9 . (-1)

    7x = -9

      x = -9/7

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C) 9x - 3(2x + 2) = 15

   9x - 6x + 6 = 15

   9x - 6x = 15 - 6

   3x = 9

     x = 9/3

     x = 3

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D) 6x + 4 = 2x - 8

    6x - 2x = -8 - 4

    4x = -12

      x = -12/4

      x = -3