3x(в квадрате)+8x-3=0

3x^2 + 8x - 3 = 0D = b^2 - 4ac = 64 + 36 = 100 = 10^2x1 = ( - 8 + 10) / 6 = 2/6 = 1/3x2 = ( - 8 - 10) / 6 = - 3