9x^2-12x-4 корни уравнения

9x^2 - 12x - 4 = 0a=9, b=-12, c=-4k = b/2 = -12/2 = -6D1 = k^2 - ac = (-6)^2 - 9*(-4) = 36 + 36 = 72 > 0x1 = -k + √72/a = 6+√72/a = 6+2√18/9;x2 = -k - √72/a = 6-√72/a = 6 - 2√18/9; Ответ : 6+2√18/9; 6 - 2√18/9;