Factorise: 16v -24v²
1 answer:
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Answer:
Step-by-step explanation:
An arithmetic sequence is of the form:
While a geometric sequence is of the form:
notice that first, we have a change of sign in our sequence, so we already can discard the arithmetic sequence.
In fact, the pattern is kinda easy to see.
The first term is:
A₁ = 2
the second term is:
A₂ = -10
notice that:
A₂/A₍ = r = -10/2 = -5
The third term is:
A₃ = 50
the quotient between the third term and the second term is:
A₃/A₂ = 50/-10 = -5
Whit this we can already conclude that the n-th term of our sequence will be:
Then the summation will be something like:
We can write:
Then the summation is just: