Answer:
for all n>0,
Step-by-step explanation:
Let be the sequence described.
A geometric sequence has the following property: there exists some r (the ratio of the sequence) such that forr all n>0.
To find r, note that
Similarly
Thus for all n>0, and
so, this is a quadratic equation, meaning two solutions, and we have a factored form of it, meaning you can get the solutions by simply zeroing out the f(x).
so the zeros/solutions are at x = 3 and x = -11, now, bearing in mind the vertex will be half-way between those two, checking the number line, that midpoint will be at x = -4, so the vertex is right there, well, what's f(x) when x = -4?