Question

решите уравнения(всё расписать,все действия) :

Answer 1

$4) 6 x^{2} -7x+1=0\D=49-24=25 \ sqrt{D} =5 \ x_{1} = frac{7+5}{12} = frac{12}{12} =1 \ \ x_{2} = frac{7-5}{12} = frac{2}{12} = frac{1}{6} \ \ 5) x^{2} +2x-15=0 \ D=4+60=64 \ sqrt{D} =8 \ x_{1} = frac{-2+8}{2} = frac{6}{2} =3 \ \ x_{2} = frac{-2-8}{2} =- frac{10}{2} =-5$

$6) x^{2} -6x-16=0 \ D=36+64=100 \ sqrt{D} =10 \ x_{1} = frac{6+10}{2} = frac{16}{2} =8 \ \ x_{2} = frac{6-10}{2} = frac{-4}{2} =-2$