Question

Am nevoie de ajutor...

Answer 1

1.
a) x+4≤ -3
x≤ -3-4
x≤ -7
x∈ {-∞;7]
b) -2x+1≥ -3x+4-5x
-2x+8x≥4-1
6x≥3
x≥1/2
x≥0.5
x∈[0.5,∞}
c) -5x+6< -4
-5x< -6-4
-5x< -10
x< -10: -2
x< 2
x∈{-∞,2}
d) 3x+5≤4x+2
5-2≤4x-3x
3≤x sau x≥3
x∈[3; +∞}
e) 3(x+4)-5 >2(x+1)
3x+12-5>2x+2
3x-2x>2-7
x > -7
x∈{ -7; +∞}
2.
3x-2≥5x-4
4-2≥5x-3x
2≥2x
x≤1
R: -4; -3; -2; -1( nr negative mai mari decât -5)

|x+1|≤4
x+1≤4          sau          x+1≤ -4
x≤3                                x≤ -5

R: -4; -3; -2; -1( nr negative mai mari decât -5)