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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