Wyznacz współżędne punktów wspólnych hiperboli y=2x+2:x-1 i prostej y=x+1
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2x+2:x-1 =x+1
2x+2=(x+1)(x-1)
2x+2=x^2-1
x^2-2x-3=0
delta=4+12=16
x1=2-4/2=-2/2=-1
x2=2+4/2=6/2=3
y1=-1+1=0
y2=3+1=4
są dwa punkty(-1, 0) (3,6)
2x+2
------= x+1 /*(x-1) x≠1
x-1
(x+1)(x-1)=2x+2
x² -1 -2x-2=0
x²-2x-3=0
Δ=b²-4ac=4+12=16 √Δ=4
x1=(-b-√Δ)/2a=(2-4)/2=-2/2=-1
x2=(-b+√Δ)/2a=(2+4)/2=6/2=3
y=x+1
y=-1+1 U y=3+1
y=0 y=4
odp:
(-1, 0) U (3 , 4)
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2x+2:x-1 =x+1
2x+2=(x+1)(x-1)
2x+2=x^2-1
x^2-2x-3=0
delta=4+12=16
x1=2-4/2=-2/2=-1
x2=2+4/2=6/2=3
y1=-1+1=0
y2=3+1=4
są dwa punkty(-1, 0) (3,6)
2x+2
------= x+1 /*(x-1) x≠1
x-1
(x+1)(x-1)=2x+2
x² -1 -2x-2=0
x²-2x-3=0
Δ=b²-4ac=4+12=16 √Δ=4
x1=(-b-√Δ)/2a=(2-4)/2=-2/2=-1
x2=(-b+√Δ)/2a=(2+4)/2=6/2=3
y=x+1
y=-1+1 U y=3+1
y=0 y=4
odp:
(-1, 0) U (3 , 4)