Question 466681
{{{3x^2-3(x+2)^2}}}

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

difference of two squares

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

{{{3((2x-2)(-2))}}}

{{{(3(2(x-2)(-2)))}}}
3*2*(-2)(x-2)

-12(x-2)


2. 12x^2-27(3+x)^2 

{{{3(4x^2-9(3+x)^2)}}}

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

{{{3((2x+9-3x)((2x-9+3x)))}}}

{{{(3(9-x)(5x-9))}}}