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b) -x^2 -6x +16=0 | (-1)
x^2 + 6x -16=0
(x+8)(x-2)=0
x=-8 lub x=2
c) -2x^2 + 3x + 2 ≥ 0
Δ= 9 + 16= 25
√Δ= 5
x1=-3 +5 / -4 =-1/2
x2= -3 - 5/-4= 2
rysunek paraboli --> x ∈ <-1/2, 2>