Question 1088673


1. 
{{{1-(x+b)^2}}}
{{{1-(x^2+2xb+b^2)}}}
{{{1-x^2-2xb-b^2}}}
{{{-(b^2+x^2+2xb-1)}}}
{{{-(b^2+xb+b +xb +x^2+x -b-x-1)}}}
{{{-(b(b+x+1) +x(b +x+1) -(b+x+1))}}}
{{{-(b + x - 1)(b + x + 1)}}}

2.
{{{27x^2-48y^2}}}
{{{3(9x^2 - 16y^2)}}}
{{{3((3x)^2 - (4y)^2)}}}
{{{3(3x-4y)(3x-4y)}}}

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

{{{x^2-cross(y^2)+x^2+2xy+cross(y^2)}}}

{{{2x^2+2xy}}}

{{{2x(x+y)}}}