Question

Que polinomio se obtem calculando o produto [2+(a-b)]*[2-(a-b)]?

Answer 1

$[2+(a-b)]*[2-(a-b)]\\\\ = 2^2-(a-b)^2\\\\ = 4-(a^2-ab+b^2)\\\\ = 4 -a^2 +2ab -b^2\\\\= -a^2 + 2ab - b^2 + 4$