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(a + b) (a - b) = a² - b²
.............................................................
(3x - 11) (3x - 11)
3x² + 11²
9x² + 121
3x . 3x + 3x . 11 - 11 . 3x - 11. 11
3 . 3x² + 3 . 11x - 33x - 121
9x² + 33x - 33x - 121
9x² - 121
Respuesta :
9x² - 121