Verified answer

6x^2-13x-5=0

D=b^2-4ac=(-13)^2-4*6*(-5)=169-(120)=169+120=189

VD=V189=V9*21=3V21

                                         13+3V21

x1 = (13+3V21)/2*6= -------------------

                                                12

                                          13-3V21

x2 = (13-3V21)/2*6=---------------------

                                               12

по-моему так....
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