Oblicz miejsce zerowe funkcj kwadratowej
(wykres + tabela)
a) f(x)= x^2 -6x +9
b) f(x) = -3x^2 -2x +1
c) f(x) = 2x^2 + 6x
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a) delta=b2-4ac
delta=46-36
delta=0
Xo=-b/2a
Xo=6/2*1=3
b)delta=4-12
delta=-8
Xo=brak
c)delta=36-0
delta=36
X1=-b-delta/2a
X1=-6-6/2*2
X1=4
X2=-b+delta/2a
X2=-6+6/2*2
X2=4
a)
a= 1 b= -6 c= 9
Δ=36-4x9
Δ=36-36=0
x₁= 6/2
x₁= 3
b)
a= -3 b= -2 c= 1
Δ= 4+12
Δ=16
√Δ=4
x₁= 2-4/-6
x₁=1/3
x₂=2+4/-6
x₂= -1
c) 0=2x(x+3)
2x₁=0 i x₂+3=0
x₁=0 i x₂= - 3