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3x^2 + 7 ≥ 3*0+ 7 > 0 -> x∈R
x^2 + 1 ≥ 0 + 1 ≥ 0 -> x∈R
5x+5 = 0 dla x=-1
(5x+5)^2 > 0 -> x∈R\{-1}
x^2-3≥0
(x-3)(x+3)≥0 --> x∈(-∞,-3] U [3,+∞)
x^2-2≥0
(x-√2)(x+√2)≥0 --> x∈(-∞,-√2] U [√2,+∞)