Question

(X - 1)(X - 2) + (X - 3)(X - 4) = 2(X² - 5X +7)

Answer 1

(X - 1)(X - 2) + (X - 3)(X - 4) = 2(X² - 5X + 7)
X² - X × 2 - 1X + 2 + X² - X × 4 - 3X + 12 = 2X² - 2 × 5X + 14
2X² - 2X  - X - 4X - 3X + 14 = 2X² - 10X + 14
2X² - 10X + 14 = 2X² - 10X + 14
2X² - 10X = 2X² - 10X
-10X = -10X
0 = 0
Ecuación idéntica o identidad.