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y=-(x-3)²+1
y=-(x²-6x+9)+1
y=-x²+6x-9+1
y=-x²+6x-8 postac ogólna
Δ=36-32=4
√Δ=2
x₁=(-6-2)/-2=-8/-2=4
x₂=(-6+2)/-2=-4/-2=2
y=-(x-4)(x-2) postac iloczynowa
y=-(x²-6x+9)+1
y=-x²+6x-9+1
y=-x²+6x-8
a=-1
b=6
c=-8
Δ=b²-4ac=6²-4(-1)*(-8)=36-32=4
√Δ=√4=2
x1=(-b+√Δ)/2a=(-6+2)/(-2)=(-4)/(-2)=2
x2=(-b-√Δ)/2a=(-6-2)/(-2)=(-8)/(-2)=4
postać iloczynowa: a(x-x1)(x-x2)
-1*(x-2)(x-4)=-(x-2)(x-4)