Równania II stopnia
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a) x^2-10x+9=0
b) -x^2-3x+4=0
c)9x^2-18x=0
d)6x^2-36=0
e)3x^2-9=0
a) Δ= b²-4ac=100-36=64 √Δ=8
x1=(-b-√Δ)/2a = (10-8)/2=1
x2=(-b+√Δ)/2a=(10+8)/2=9
odp: x=1 ∨ x=9
b) Δ=9+16=25 √Δ=5
x1=(3-5)/-2=1 ∨ x2=(3+5)/-2=-4
c)
9x(x-2)=0
9x=0 ∨ x-2=0
x=0 x=2
d)
(√6x-6)(√6x+6)=0
√6x-6 =0 ∨ √6x+6=0
x=√6 x=-√6
e)
(√3x-3)(√3x+3)=0
√3x-3=0 ∨ √3x+3=0
x=√3 x=-√3
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a) Δ= b²-4ac=100-36=64 √Δ=8
x1=(-b-√Δ)/2a = (10-8)/2=1
x2=(-b+√Δ)/2a=(10+8)/2=9
odp: x=1 ∨ x=9
b) Δ=9+16=25 √Δ=5
x1=(3-5)/-2=1 ∨ x2=(3+5)/-2=-4
c)
9x(x-2)=0
9x=0 ∨ x-2=0
x=0 x=2
d)
(√6x-6)(√6x+6)=0
√6x-6 =0 ∨ √6x+6=0
x=√6 x=-√6
e)
(√3x-3)(√3x+3)=0
√3x-3=0 ∨ √3x+3=0
x=√3 x=-√3