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x²+6x-7=0
Δ=b²-4ac=36+28=64
√Δ=8
x₁=(-b-√Δ):2a=(-6-8):2=-7
x₂=(-b+√Δ):2a=(-6+8):2=1
2x=5x²+1
5x²-2x+1=0
Δ=4-20=-16
Δ<0=brak pierwiastków
2-4x=3x²
3x²+4x-2=0
Δ=16+24=40
√Δ=2√10
x₁=(-4-2√10):6=-⅓(2+√10)
x₂=(-4+2√10):6=-⅓(2-√10)
x²+6x-7=0
Δ=b²-4ac
Δ=36-4*1*(-7)
Δ=36+28=64
√Δ=8
x1=-b+√Δ:2a=(-6)+8:2=2:2=1
x2=-b-√Δ:2a=(-6)-8:2=(-14):2=(-7)
2x=5x²+1
5x²-2x+1=0
Δ=b²-4ac
Δ=(-2)²-4*5*1=4-20
Δ=-16 brak rozwiązania
2-4x=3x²
3x²+4x-2+0
Δ=b²-4ac
Δ=4²-4*3*(-2)=16+24
Δ=40
√Δ=√40=2√10
x1=-b+√Δ:2a=-4+2√10:6=2+2√10:3
x2=-b-√Δ:2a=-4-2√10:6=2-2√10:3