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pierwiastek ten to (-2√3)
możesz też to obliczyć inaczej ,ale to niepotrzebne
y=7(x+2√3)(x+2√3)
y=7(x+2√3) do kwadratu
y=7( x kwadrat +4√3x+12)
y=7x kwadrat+28√3x+84
delta=b kwadrat-4ac=2352-2352=0
x 0=-b/2a=-28√3/14=-2√3