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4x²+4x+1=0
Δ=4²-4*4*1
Δ=16-16
Δ=0
x0=-4/(2*4)
x0=-4/8
x0=-1/2
Brak rozwiązań.
2)36>(x+3)²
36-(x+3)²>0
27-x²-6x=0
Δ=(-6)²-4*27*(-1)
Δ=36+108
Δ=144
√Δ=√144=12
x1=(6-12)/(2*(-1))
x1=-6/(-2)
x1=3
x2=(6+12)/(2*(-1))
x2=18/(-2)
x2=-9
x∈(-9,3)
3)(3x-2)²<9
(3x-2)²-9<0
9x²-12x-5=0
Δ=(-12)²-4*9*(-5)
Δ=144+180
Δ=324
√Δ=√324=18
x1=(12-18)/(2*9)
x1=-6/18
x1=-1/3
x2=(12+18)/(2*9)
x2=30/18
x2=5/3
x∈(-1/3,5/3)
4)(x+3)²-(2x-1)²>0
10x-3x²+8=0
Δ=10²-4*(-3)*8
Δ=100+96
Δ=196
√Δ=√196=14
x1=(-10-14)/(2*(-3))
x1=-24/(-6)
x1=4
x2=(-10+14)/(2*(-3))
x2=4/(-6)
x2=-2/3
x∈(-2/3,4)