Question

$Descompusa in factori, expresia x^{2} +2xy+y^{2} -81t^{2} este$

Rezultatul corect este (x+y-9t)(x+y+9t) Dar vreau rezolvarea

Answer 1

x² + 2xy + y² - 81t² =

(x + y)² - 81² =

(x + y)² - (9t)² =

(x + y - 9t)(x + y + 9t)