Question 952492

{{{12x^3 + 6x^2-3}}}

{{{3(4x^3 + 2x^2-1)}}}........write {{{2x^2}}} as {{{4x^2-2x^2}}}, add {{{2x}}} and {{{-2x}}} 

{{{3(4x^3+4x^2+2x-2x^2-2x-1)}}} group

{{{3((4x^3 -2x^2)+(4x^2-2x)+(2x-1))}}}

{{{3(2x^2(2x -1)+2x(2x-1)+(2x-1))}}}

{{{3(2x-1)(2x^2+2x+1)}}}