Situation1:FactorisingquadraticFindingcommonfactorsexpressions（分解二次表达式）x3xe.g.2 means2 bxc so,xisafactorofbothterms.2So,x3xx(x3)commonfactor Situation2:Thedifferenceoftwosquares e.g x9(x3)(x3)(x3)2 22 AminussignAnotherOnesquaresquare Ex...