Odpowiedzi

2013-07-18T07:40:19+02:00
  • Użytkownik Zadane
2013-07-18T08:39:52+02:00

3x² > 8x+3

3x² - 8x - 3 > 0

Δ = (-8)² - 4 * 3 * (-3) = 64 + 36 = 100

√Δ = 10

x1 = (8 - 10)/6 = -2/6 = -1/3

x2 = (8 + 10)/6 = 18/6 = 3

 

++++                        +++++++  ramiona paraboli do góry skierowane

----------o----------------o------------------>

         -1/3  ----------  3

 

odp. x ∈ (-oo, -1/3) u (3, +oo)