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p = -b/2a = 8/8 = 1
q = -Δ/4a
Δ = b² - 4ac = (-8)² - 4*4*1 = 64 - 16 = 48
q = -48/16 = -3
W = (1; -3)
a > 0, ramiona paraboli w górę
zw = <-3; +∞)
f. rosnąca x∈<1; +∞)
f. malejąca x∈(-∞; 1>