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Aplicas.
(x - a)(x - b) = x² + (-a - b)x + (- a)(- b)
(x - 5)(x - 3) =
x² + (- 5 - 3)x + (- 5)(- 3) =
x² + (- 8x) + 15 =
x² - 8x + 15
Respuesta.
x² - 8x + 15
x2-3x-5x+15
x2-8x+15
resultado
x2-8x+15