Verified Answer :

  1. steps
              
             6w^2 + - 3w + -18
             -18 + -3w + 6w^2
             3(-6 + -1w + 2w^2
             3((-3 + -2w)(2 + -1w))
             3(-3 + -2w)(2 + -1w)

    final answer :   3(-3 + -2w)(2 + -1w)
arthurpdc

\(22)~6w^2-3w-18=3(2w^2-w-6)=3(2w+3)(w-2)\\\\ 23)~a^3b^2-a^2b+a=a(a^2b^2-ab+1)\\\\ 24)~6x^3+12x^2y-x-2y=6x^2(x+2y)-(x+2y)=(6x^2-1)(x+2y)\\\\ 25)~2y^2-30y+72=2(y^2-15y+36)=2(y-3)(y-12)\)