Question

4) Resolva as equações
a)
| x x + 1 |
| 8 3 | =0

b)
| x 3 x |
| 2 4 1 |
| 1 2 x| =5​

Answer 1

a) |x x + 1|

|8 3| = 0

8 . (x + 1) = 3 . x

8x + 8 = 3x

8x - 3x = - 8

5x = - 8

x = - 8

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5

b) | x 3 x | x 3

| 2 4 1 | 2 4 = 5

| 1 2 x | 1 5

4x + 3 + 10x - 4x - 2x - 6x = 5

4x + 10x - 4x - 2x - 6x = 5 - 3

14x - 12x = 2

2x = 2

x = 2

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2

x = 1