5x^2 - 7x + 2 = 0;
D = b^2 - 4ac = (-7)^2 - 4 * 5 * 2 = 49 - 40 = 9;
x1 = (-b + √D)/2a = (7 + √9)/2 * 5 = (7 + 3)/10 = 10/10 = 1;
x2 = (-b - √D)/2a = (7 - √9)/2 * 5 = (7 - 3)/10 = 4/10 = 2/5.
5x^2 - 7x + 2 = 0;
D = b^2 - 4ac = (-7)^2 - 4 * 5 * 2 = 49 - 40 = 9;
x1 = (-b + √D)/2a = (7 + √9)/2 * 5 = (7 + 3)/10 = 10/10 = 1;
x2 = (-b - √D)/2a = (7 - √9)/2 * 5 = (7 - 3)/10 = 4/10 = 2/5.