6x^2−102x+432=0
6x^2−102x+432=0 ..... factor out the 6, first
6 (x^2 - 17x + 72) = 0 divide both sides by 6
x^2 - 17x + 72 = 0 factor, again
(x - 9) (x - 8) = 0 and setting each factor to 0, x =8 or x = 9
