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3x²-8x-3 > 0
a = 3
b = -8
c = -3
Δ = b²-4ac
Δ = (-8)²-4*3*(-3)
Δ = 64+36
Δ = 100
√Δ = 10
Δ> 0 czyli 2 pierwiastki
x1 = -b-√Δ/2a
x1 = -(-8)-10/2*3
x1 = 8-10/6
x1 = -2/6
x1 = -1/3
x2 = -b+√Δ/2a
x2 = 8+10/6
x2 = 18/6
x2 = 3
a > 0 czyli ramiona paraboli w górę, czyli x ∈ (-∞ ; -1/3) υ (3; +∞)