Question

(2x - 1)^2 - 2(x + 1)^2

Answer 1

Aplicas.
Productos Notables.
(a + b)² = a² + 2ab + b²
(a - b)² = a² - 2ab + b²

(2x - 1)² - 2(x + 1)² =
(2x)² - 2(2x)(1) + 1² - 2(x² + 2(x)(1) + 1) =
4x² - 4x + 1 - 2(x² + 2x + 1) =
4x² - 4x + 1 - 2x² - 4x - 2 =       
2x² - 8x - 1

Respuesta.
2x² - 8x - 1