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Δ=8²-4*1*15
Δ=64-60
Δ=4
√Δ=2
x∈(-∞;-3) i (-5;+∞)
Δ=(-10)²-4*1*25
Δ=100-100
Δ=0
x=5
Δ=(-1)²-4*1*(-2)
Δ=1+8
Δ=9
√Δ=3
x∈(-1;2)
Δ=6²-4*(-1)*(-9)
Δ=36-36
Δ=0
x=3
Δ=(-8)²-4*1*7
Δ=64-28
Δ=36
√Δ=6
x∈(1;7)
brak miejsc zerowych
x∈(-∞;+∞) czyli x∈R