Question

Qual a resposta de (1+x)(1-x)-(1+x)² ?

Answer 1

$(1 + x)(1 - x) - (1 + x) {}^{2} \\ \\ 1 - {x}^{2} - (1 + 2x + {x}^{2} ) \\ \\ 1 - {x}^{2} - 1 - 2x - {x}^{2} \\ \\ - 2 {x}^{2} - 2x \\ \\ 2( - {x}^{2} - x)$