Factoring: 9x3-18x2-x+2.
Thoughtfully split the expression at hand into groups, each group having two terms :
Factoring: 9x2-1.
Check : 9 is the square of 3.
A product of several terms equals zero.
Solve : 3x+1 = 0.
Solve : 3x-1 = 0.
Solve : x-2 = 0.