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(a + b)² = a² + 2ab + b²
(a - b)² = a² - 2ab + b²
...................................................
Calcular.
(x + 7)² - (x - 7)²
x² + 2(x)(7) + 7² - (x² - 2(x)(7) + 7²)
x² + 14x + 49 - x² + 14x - 49
Eliminamos los x² y 49.
14x + 14x + 49
28x
Respuesta.
28x