rozwiąż nierówności:
>9
-2x-90
-3+2x0
--x+2<0
a) x>3 x<-3
b) -2x-90
Δ=4+36=40 √Δ=2√10
x=2√10+22=√10+1
x=-√10+1
x∈(-√10+1;√10+1)
x(-3x+2)=0
x=0 x=⅔
x∈(-∞0)(⅔∞)
(-x+1)²=0
x=1
x∈{1}
x^2>9/√
x=3
x²-2x-9≤0
Δ=(-2)²-4·1·(-9)
Δ=4+36=40
x₁=2+√40/2=2+√10*4/2=2+10√2/2=12√2/2=6√2
x₂=2-√40/2=2-10√2/2=8√2/2=4√2
-3x²+2x≥0
Δ=2²-4*(-3)*0
Δ=4-0=4
x₁=-2+√4/2*(-3)=-2+2/-6=0
x₂=-2-√4/-6=-4/-6=2/3
-x²-x+2<0
Δ=(-1)²-4*(-1)*2
Δ=1+8=9
x₁=1+√9/2*(-1)=1+3/-2=4/-2=-2
x₂=1-√9/-2=1-3/-2=-2/-2=-1
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a) x>3 x<-3
b) -2x-90
Δ=4+36=40 √Δ=2√10
x=2√10+22=√10+1
x=-√10+1
x∈(-√10+1;√10+1)
-3+2x0
x(-3x+2)=0
x=0 x=⅔
x∈(-∞0)(⅔∞)
--x+2<0
(-x+1)²=0
x=1
x∈{1}
x^2>9/√
x=3
x²-2x-9≤0
Δ=(-2)²-4·1·(-9)
Δ=4+36=40
x₁=2+√40/2=2+√10*4/2=2+10√2/2=12√2/2=6√2
x₂=2-√40/2=2-10√2/2=8√2/2=4√2
-3x²+2x≥0
Δ=2²-4*(-3)*0
Δ=4-0=4
x₁=-2+√4/2*(-3)=-2+2/-6=0
x₂=-2-√4/-6=-4/-6=2/3
-x²-x+2<0
Δ=(-1)²-4*(-1)*2
Δ=1+8=9
x₁=1+√9/2*(-1)=1+3/-2=4/-2=-2
x₂=1-√9/-2=1-3/-2=-2/-2=-1