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Delta = B kwadrat - 4ac
Delta = 16 + 48 = 64
Pierwiastek z delty = 8
x1 = -b - delta / 2a
x1 = -4 - 8 / -4
x1 = 3
x2 = -b +delta /2a
x2 = -1
A jest ujemne ramiona do dołu