Question

ayuda es para mañana​

Answer 1

Respuesta:

1) x = 2

2) x = 1

3) x = 2

4) x = 18

5) x = 14

Explicación paso a paso:

1) 2(3x - 2) = 8

6x - 4 = 8

6x = 8 + 4

6x = 12

x = 12/6

x = 2

2) 9(13-x) - 4x = 5(21 - 2x) + 9x

117 - 9x - 4x = 105 - 10x + 9x

- 9x - 4x + 10x - 9x = 105 - 117

- 22x + 10x = - 12

- 12x = - 12

x = -12/-12

x = 1

3) 2[3(x -2) +5(x - 3)] +x = - 8

2[3x - 6 +5x - 15] +x = - 8

6x - 12 + 10x - 30 + x = - 8

6x + 10x + x = - 8 + 30 + 12

17x = 34

x = 34/17

x = 2

4) x² - (x -4)² = 128

x² - (x² - 8x + 16) = 128

x² - x² + 8x - 16 = 128

8x = 144

x = 144/8

x = 18

5) (x+2)² - x² = 60

x² + 4x + 4 - x² = 60

x² + 4x - x² = 60 - 4

4x = 56

x = 56/4

x = 14