Question

qual a resposta : (x-1)*(x+1)=1​

Answer 1

$\sf (x - 1)(x + 1) = 1 \\\sf x ^{2} - 1 = 1 \\\sf x ^{2} = 1 + 1 \\\sf x ^{2} = 2 \\\sf \red{ x =± \sqrt{2} }$