Zad. a)-x²-x>-3 b) 4x² +16x ≤ 48 c) x³-5x ≥ 2

a. x²+x<3 x(x+1)<3 x<3 ∧ x+1>3 x∈(2,3) b.4x(x+4)≤18 /2 2x≤9 ∧ x+4≥9 x≤4,5 ∧ x≥5 x∈(-∞;4,5)∨(5,∞) c.x(x²-5)≥2 x(x-√5)(x+√5)≥2 x≥2 x-√5≤2 x+√5≥2