Răspuns :
a ) 2x + 3 < -3
2x < -3 - 3
2x < -6
x < -3
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b ) 3x - 7 < x + 5
3x - x < 5 + 7
2x < 12
x < 6
2x < -3 - 3
2x < -6
x < -3
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b ) 3x - 7 < x + 5
3x - x < 5 + 7
2x < 12
x < 6
a)
2 x + 3 < - 3
2 x < - 3 - 3
2 x < - 6
x < ( - 6 ) : 2
x < - 3 ⇒ x ∈ ( - ∞, -3)
b)
3 x - 7 < x + 5
3 x - x < 5 + 7
2 x < 12
x < 12 : 2
x < 6 ⇒ x ∈ ( - ∞, 6)
2 x + 3 < - 3
2 x < - 3 - 3
2 x < - 6
x < ( - 6 ) : 2
x < - 3 ⇒ x ∈ ( - ∞, -3)
b)
3 x - 7 < x + 5
3 x - x < 5 + 7
2 x < 12
x < 12 : 2
x < 6 ⇒ x ∈ ( - ∞, 6)