Scroll down to the Negative Polynomials: http://www.regentsprep.org/regents/math/algtrig/atv1/revFactoring.htm
Factoring Completely: http://www.regentsprep.org/regents/math/algebra/av6/ltricomplete.htm
Take the Quiz, especially the CHALLENGE "1,2,4,5 and 10" http://www.regentsprep.org/regents/math/algtrig/atv1/PracFact3.htm