Odpowiedzi

2009-11-01T12:13:27+01:00
2x² - 8 > 0
2(x² - 4) > 0
2(x - 2)(x + 2) > 0
(x - 2)(x + 2) > 0

x ∈ (-ω, -2) u (2, ω)
2009-11-01T12:56:15+01:00
2(x²-4)>0
2(x-2)(x+2)>0
x=2 v x=-2
rysujemy parbole ramionami do góry
x∈(-∞,-2)u(2,∞)