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(x + y)² = x² + 2xy + y²
(x - y)² = x² - 2xy + y²
..............................................................
M = (x + 2)² - (2 - x)² + (x - 4)² - x² - 16
= x² + 4x + 4 - (4 - 4x + x²) + x² - 8x + 16 - x² - 16
= x² + 4x + 4 - x + 4x - x² + x² - 8x - x²
= x² + 4x + 4 - x + 4x - 8x - x²
= 7x + 4
Respuesta.
7x + 4