Oblicz:
x2-x-2<0
Δ= 1-4*(-2)*1
Δ= 9
√Δ= 3
x1= 1-3/2
x1= -1
x2= 1+3/2
x2= 2
x należy (-1,2)
x²-x-2 < 0
Δ=1+8=9
√Δ=3
x1=1-3/2=-2/2=-1
x2=1+3/2=4/2=2
+ + + - - - - - - - + + +
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-1 2
x∈(-1,2)
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Δ= 1-4*(-2)*1
Δ= 9
√Δ= 3
x1= 1-3/2
x1= -1
x2= 1+3/2
x2= 2
x należy (-1,2)
x²-x-2 < 0
Δ=1+8=9
√Δ=3
x1=1-3/2=-2/2=-1
x2=1+3/2=4/2=2
+ + + - - - - - - - + + +
-----.-------------.------>
-1 2
x∈(-1,2)