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-1/2x + 3x +8 >_0 / *2
-x2 + 6x +16 >_ 0 / : x
-x +6 +16 >_ 0
-x >_ -6 -16 +0
-x >_ -22 / : (-1)
x <_ 22
x³ - 2x² - 3x +6 = 0
x² (x-2) - 3 (x-2) = 0
(x-2) (x² - 3) =0
x-2 =0 lub x²-3 =0
x=2 lub x² =3
x = - lub x =