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Δ= b²-4ac
Δ= 9 - 8
Δ=1
x1 = -b -√Δ /2a = 3 - √1 / 2
x2 = -b + √Δ /2a = 3 + √1 /2
2x²-4x =3>0
Popraw przykład
-x²+3x-12<0
Δ= b²-4ac
Δ= 9 - 4*(-1)*(-12)
Δ= -39
Δ < 0 brak rozwiązań
x²-2x+4>0
Δ= b² - 4ac
Δ= 4 - 16
Δ= -12
Δ < 0 brak rozwiązań
x²-6x+5≤0
Δ= b² -4ac
Δ= 36 - 4*1*5
Δ= 36 - 20
Δ= 16
√Δ = 4
x1 = -b -√Δ /2a = 6 - 4 / 2 = 1
x2 = -b +√Δ /2a = 6 + 4 /2 = 5