9x^2-21x+6=0 ...............

Question

9x^2-21x+6=0 ...............

Answer 1

D = 21^2 - 4*6*9 = 441 - 216 = 225, √D = 15
x1 = 21 + 15 / 18 = 2
x2 = 21 - 15 / 18 = 6/18 = 1/3