Question

Calculati:
(x+1)²-2(x-1)²-3(x+1)(x-1)

Answer 1

=x(la patrat,,2'')+2x*1+1-2(x(patrat)-2x*1+1)-3(x( la patrat)-1(la patrat))
=x(la patrat,,2'')+2x*1+1-2x(patrat x)+4x-2-3x(patratx)+3
=4x(patrat x)+6x+2

Answer 2

   
[tex](x+1)^2-2(x-1)^2-3(x+1)(x-1) = \\ = x^2+2x+1 -2(x^2-2x+1)-3(x^2-1)=\\ = x^2+2x+1 -2x^2 +4x-2-3x^2+3=\\ = x^2 -2x^2-3x^2+2x+4x +1 -2+3= \boxed{-4x^2+6x +2}[/tex]