Question

ajutor a,b,c
dau coroana​

Answer 1

Răspuns:

Salutare!

a) 3•x+6≥0

3x+6≥0

3x≥-6 |:3

x≥-2 ==> x€[-2;+∞)

b) -4•x+2≤0

-4x+2≤0

-4x≤-2 |•(-1)

4x≥2

x≥2/4 <==> x≥1/2 ==> x€[1/2;+∞)

c)-5•(x+2)>0

-5•x+(-5)•2>0

-5x-10>0

-5x>10 |:5

-x>2 |•(-1)

x<2 ==> x€(-∞;2)