(6X
　(6x-1)(2x-1)(3x-1)(x-1) + x² = [(6x-1)(x-1),(2x-1)(3x-1)] + x² = (6x²-7x+1)(6x²-5x+1) + x² = (6x²-6x+1 - x)(6x²-6x+1 + x) + x² = (6x²-6x+1)² - x² + x² = (6x² - 6x + 1)² = {6[x - (3+√3)/6,x - (3-√3)/6]}² = 36[x - (3+√3)/6]²[x - (3-√3)/6]²