3x²﹢2x﹣3
=3（x²+2/3x）-3
=3(x²+2/3x+1/9)-1/3-3
=3(x+1/3)²-10/3
=(√3x+√3/3)²-10/3
=(√3x+√3/3+√30/3)(√3x+√3/3-√30/3)