3х²+6х-5=0
Д=6²-4*3*(-5)=96
х=-6±4√6/6
х=-6+4√6/6=-3+2√6/3
х=-6-4√6/6=-3-2√6/3
ответ
х1=-3-2√6/3 , х2=-3+2√6/3
