Question

Write in expanded form (2+x-2y)^2

Answer 1

heya..
by using identity of (a+B+C)^2 we can expand this..
we know (a+B+C)^2=a^2+b^2+c^2+2ab+2bc+2ca


So..{2+x+(-y)}^2=
2^2+x^2+(-y)^2+2(2x)+2(-xy)+2(-2y)

=4+x^2+y^2+4x-2xy-4y

hope it's helpful

Answer 2

Answer:

here it is

[(2-2y)+x]^2= (2-2y)^2+x^2+2x(2-2y)

[(2-2y)+x]^2= 4-8y+4y^2+x^2+4x-4xy

if u want to use (a + b + c)2 = a^2 + b^2 + c^2 + 2ab + 2bc + 2ca. this formula seperate -2y than u will get the answer.