28x²-5x-30=0Помогите решить.

28x^2 - 5x - 30 = 0 D = b^2 - 4ac = (-5)^2 - 4*28*(-30) = 25 + 3360 = 3385 VD = V3385            5 + V3385              5 - V3385 x1 = --------------------- = ----------------------------               2*28                         56           5 - V3385                  5 - V3385 x2 = -------------------------- = -----------------------                2*28                           56