Question

Rezolvati in R ecuatia si reprezentati pe axa multimea solutie ei:
a) -2·(x+5) mai mic ca 12
b)-o doime(x+2)≥ -3
c)5·(3-2x)≤15
d)4·(8-3x)mai mare ca 12

Ajuttorr Va ROG!!!!!

Answer 1

a) -2x-10≤12
-2x≤12+10
-2x≤22
-x≤22/2
-x≤11    ·(-1)
x≥-11
x∈[-11,+∞)

b) -(x+2)/2≥-3
-x-2≥2·(-3)
-x-2≥-6
-x≥-6+2
-x≥-4             ·(-1)
x≤4
x∈(-∞,4]

c) 15-10x≤15
-10x≤15-15
x≤0
∈(-∞,0]

d) 32-12x≥12
-12x≥12-32
-12x≥-20                  ··(-1)
x≤20/12
x≤1,(6)
x∈(-∞, 1,(6)]