Respuesta :

(s + 1)(s - 1) = s^2 - 1
= 19-1 = 18

Answer:

(s + 1)(s - 1) = s^2 - 1

= 19-1 = 18

Step-by-step explanation:

(s + 1)(s - 1) = s^2 - 1

= 19-1 = 18

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