Question

OIH FAMÍLIA MIM AJUDAR AKI ✊❤​

Answer 1

Resposta:

a) 7x - 8 < 11x + 7

7x - 8 + 8 < 0

7x < 11x + 7 + 8

7x < 11x + 15

(-4x)(-1) > 15(-1)

4x > - 15

x > - 15/4

___________

b) 5(4 - 2x) ≥ 4x + 3

20 - 10x ≥ 4x + 3

20 - 10x - 20 ≥ 4x + 3 - 20

- 10x ≥ 4x - 17

- 10x - 4x ≥ - 17 - 4x

- 14x ≥ - 17

(-14x)(-1) ≤ (-17)(-1)

14x ≤ 17

x ≤ 17:14

x ≤ 17/14

____________

c) x/4 + 2 > 3x - 9

x/4 > 3x - 11

x/4 . 4 > 3x . 4 - 11 . 4

x > 12x - 44

x - 12x > - 44 - 12x

- 11x > - 44

(-11x)(-1) < (-44)(-1)

11x < 44

x < 44:11

x < 4

_____________

d) 7(3x + 2) > 14 - 4(5x + 3)

21x + 14 > - 20x + 2

21x + 14 - 14 > 0

21x > - 20x + 2 - 14

21x > - 20x - 12

21x + 20x > 12  + 20x

41x > - 12

x > - 12:41

x > - 12/41