24x^3+26x^2+9x+1
=24x^3+20x^2+4x+6x^2+5x+1
=4x(6x^2+5x+1)+6x^2+5x+1
=(6x^2+5x+1)(4x+1)
=(2x+1)(3x+1)(4x+1)
你能明白,赞同