Х^2-5х=14
Х^2-5х-14=0
D=b^2-4ac
D=25+56=81
√81=9
Х1=(-b+ √D):2а
Х2=(-b-√D):2а
Х1=(5+9):2=7
Х2=(5-9):2=-2
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Х^2-5х=14
Х^2-5х-14=0
D=b^2-4ac
D=25+56=81
√81=9
Х1=(-b+ √D):2а
Х2=(-b-√D):2а
Х1=(5+9):2=7
Х2=(5-9):2=-2
Ответ: 7.