a=1 b = 2 c=-3
Δ=b²-4ac = 4+12=16
√Δ=4
a)
D: x∈ R
b) Zwf
a>0 więc Zwf to przedział <q, + ∞ )
q=-Δ/4a = -16/4=-4
odp:
<-4 , + ∞)
c)
miejsca zerowe:
x1=(-b-√Δ)/2a=(-2-4)/2 = -3
x2=(-b+√Δ)/2a=(-2+4)/2=1
x=-3 U x=1
f(x) = x² + 2x - 3
a = 1, b = 2, c = -3
D = R
--------
b)
ZW = <q; +∞>
q = -Δ/4a
Δ = b²-4ac = 4+12 = 16
q = -16/4 = -4
ZW = <-4;+∞)
------------------
x1 = (-b-√Δ)/2a = (-2-4)/2 = -3
x2 = (-b+√Δ)/2a = (-2+4)/2 = 1
MZ: -3; 1
------------
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a=1 b = 2 c=-3
Δ=b²-4ac = 4+12=16
√Δ=4
a)
D: x∈ R
b) Zwf
a>0 więc Zwf to przedział <q, + ∞ )
q=-Δ/4a = -16/4=-4
odp:
<-4 , + ∞)
c)
miejsca zerowe:
x1=(-b-√Δ)/2a=(-2-4)/2 = -3
x2=(-b+√Δ)/2a=(-2+4)/2=1
odp:
x=-3 U x=1
f(x) = x² + 2x - 3
a = 1, b = 2, c = -3
a)
D = R
--------
b)
ZW = <q; +∞>
q = -Δ/4a
Δ = b²-4ac = 4+12 = 16
q = -16/4 = -4
ZW = <-4;+∞)
------------------
c)
x1 = (-b-√Δ)/2a = (-2-4)/2 = -3
x2 = (-b+√Δ)/2a = (-2+4)/2 = 1
MZ: -3; 1
------------