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p=-1
q=-5
W=(-1,-5)
liczymy miejsca zerowe
y=(x+1)²-5=x²+2x+1-5=x²+2x-4
a=1 b=2 c=-4
Δ=b²-4ac
Δ=2²-4*1*(-4)
Δ=4+16=20
√Δ=2√5≈2*2,24=4,48
x₁=(-2-4,48):2=-3,24
x₂=(-2+4,48):2=1,23
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