Question

Calcule a solução (raiz) de cada equação:

a) 2x – 25 = 45

b) 20x – 4 = 5x

c) 2x + 4.(x – 1) + 3 = 2x + 7

d) 4x + 2.(x – 5) = 32

Answer 1

Resposta:

A) X = 35

B) X = 15/4

C) X = 6

D) X = 8

EXEMPLO

2x - 25 = 45 A

2x = 45 + 25

2x = 70

x = 70/2 (FRAÇÃO)

x = 35

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20x - 4 = 5x B

20x - 5x = 4

15x = 4

x = 4/15

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2x + 4•(x - 5) + 3 = 2x + 7 C

2x - 2x + 4x -20 = 7 - 3

4x = 20 + 4

4x = 24

x = 24/4

x = 6

__________________

4x + 2•(x - 5) = 32 D

4x + 2x - 10 = 32

6x = 10 + 32

6x = 42

x = 42/6

x = 8