this formula, doesn't rely on a product, relies on a "sum", or is namely an arithmetic sequence, aₙ₋₁ -3 is another way of saying, the value of the previous term minus 3, so it relies on the ordinal value of a term, so is an recursive formula, well, let's get it when n = 4.

The answer is x>−1/5 or x<1/5

Haz la sustitución:


Para confirmar el resultado:


Sustituye:


(Te dejaré confirmar por ti mismo.)

Sustituye:



Sustituye:


Podemos hacer que esto se vea un poco mejor:


Answer:
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