Question 1198895


Given: 




By letting {{{y=2-a}}}, simplify the expression

{{{(x+2-a)^2+(2-a-x)^2-2(x-2+a)(x+2-a)}}}
 
if {{{y=2-a}}},then

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

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

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

{{{x^2 + 2 x y + y^2+x^2 - 2 x y + y^2-2x^2 +2y^2}}}

{{{2x^2 + 2 x y  - 2 x y -2x^2 +4y^2}}}

{{{cross(2x^2) + cross(2 x y)  -cross(2 x y) -cross(2x^2) +4y^2}}}

{{{4y^2}}}


 go back and replace  {{{y}}} with {{{2-a}}}


{{{4(2-a)^2}}}=>answer