Question

7. Rezolvați în R inecuațiile: a) 3(x-1) ≤5(x + 3); c) 7x-4(3+2x) > x; b) 4(2x + 1) - 2(3x + 2) ​

Answer 1

Răspuns:

a) 3(x-1) ≤5(x + 3)

3x-3 ≤ 5x+15

-3-15 ≤ 5x-3x

2x ≥-18

x ≥ -9

x ∈ [-9,∞)

c) 7x-4(3+2x) > x

7x-12-8x > x

7x-x-8x < 12

-2x < 12

x < -6

x ∈ (-∞,-6)