[tex]17)~2x^2-x-28=(2x+7)(x-4)\\\\
18)~8m^2+6m-5=(2x-1)(4x+5)\\\\
19)~6w^2-28w+32=2(3w^2-14w+16)=2(3w-8)(w-2)\\\\
20)~16k^2-24k+8=8(2k^2-3k+1)=8(2k-1)(k-1)\\\\
21)~3x^3-21x^2+2x-14=3x^2(x-7)+2(x-7)=(3x^2+2)(x-7)\\\\
22)~a^3-9a^2b+ab-9b^2=a^2(a-9b)+b(a-9b)=(a^2+b)(a-9b)\\\\
23)~m^3-m^2n+m-n=m^2(m-n)+(m-n)=(m^2+1)(m-n)\\\\
24)~4x^3-x^2y+8xy-2y^2=x^2(4x-y)+2y(4x-y)=\\\\=(x^2+2y)(4x-y)
[/tex]
