Question

упрастите выражение (х-3)2+(х-3)(х+3)

Answer 1

(х-3)²+(х-3)(х+3) = х²-6х+9+х²-9 = 2х²-6х = 2х(х-3)

Answer 2

(х - 3)² + (х - 3)(х + 3) = х² - 2 × х × 3 + 3² + х² - 3² = х² - 6х + 9 + х² - 9 = 2х² - 6х = 2х(х - 3)