4. Найдите корни уравнения x²- 5x-14=0

Using the quadratic formula x = [-b ± √(b²-4ac)] / 2a, where a=1, b=-5, c=-14. x = [5 ± √((-5)² - 4*1*(-14))] / 2*1 = [5 ± √(25 + 56)] / 2 = [5 ± √81] / 2 = [5 ± 9] / 2. The roots are x1 = (5+9)/2 = 7 and x2 = (5-9)/2 = -2.