The given expression can't be factorised: factorise 8x^2-12x-6xy+9 - Wolfram|Alpha
Any expression can be factored if you allow any numbers (irrational and/or complex) as coefficients. Mr Fantastic is correct that this cannot be factored with integer coefficients which is what is usually meant by "factoring". Prove It is correct that what he gives is a factoring using irrational terms.