Question

Me ajudem Pf 1)resolva as inequações a) 2x+x-8>10+2 b) x-3x>20+5 c)-4x-x>_12+5 d)2x+6>-x+7 e) 5x-8 <x+15​

Answer 1

Oi...

Resolução:

a)

2x + x - 8 > 10 + 2

3x - 8 > 12

3x > 12 + 8

3x > 20

x > 20/3

x ∈ |R / x > 20/3

b)

x - 3x > 20 + 5

- 2x > 25 ⇒(- 1)

2x < - 25

x < - 25/2

x ∈ |R / x < - 25/2

c)

- 4x - x > - 12 + 5

- 5x > - 7 ⇒(- 1)

5x < 7

x < 7/5

x ∈ |R / x < 7/5

d)

2x + 6 > - x + 7

2x + x > 7 - 6

3x > 1

x > 1/3

x ∈ |R / x > 1/3

e)

5x - 8 < x + 15

5x - x < 15 + 8

4x < 23

x < 23/4

x ∈ |R / x < 23/4​

Bons estudos.