Question

04. Resolva as equações: a) 5x - 4 = 36 b) 9x - 11 = -39 - 5x c) 4 . (2x - 1) - 3 . (1 - 2x) = 4 . (4x -5) d) 5 . (50 - x) + 2x = 3 . (x + 9) - 28

Answer 1

Resposta:

a) x = 8

b) x = -2

c) x = 6,5

d) x = 41,8333...

Explicação passo a passo:

a) 5x - 4 = 36

5x = 36 + 4

5x = 40

x = 40 ÷ 5

x = 8

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b) 9x - 11 = -39 - 5x

9x + 5x = -39 + 11

14x = -28

x = -28 ÷ 14

x = -2

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c) 4 · (2x - 1) - 3 · (1 - 2x) = 4 · (4x - 5)

8x - 4 - 3 + 6x = 16x - 20

8x + 6x - 16x = 4 + 3 - 20

-2x = -13

2x = 13

x = 13 ÷ 2

x = 6,5

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d) 5 · (50 - x) + 2x = 3 · (x + 9) - 28

250 - 5x + 2x = 3x + 27 - 28

2x - 5x - 3x = 27 - 28 - 250

-6x = -251

6x = 251

x = 251 ÷ 6

x = 41,8333...