(3x+1)(3x+4)(3 x+1)(3 x+4)(3x+1)(3x+4)
(3+x)(3x−4)(3+x)(3 x-4)(3+x)(3x−4)
(3x+1)(3x−4)(3 x+1)(3 x-4)(3x+1)(3x−4)
(3x+1)(4x+3)(3 x+1)(4 x+3)(3x+1)(4x+3)