Solve the exponential equation 1/2^x-5=8^x
1 answer:
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Answer:
Step-by-step explanation:
The given sequence is 3,15,75,375,...
The first term of this geometric sequence is
The common ratio is
The explicit formula is given by:
We plug the first term and common ratio into the formula to get:
By using the integral test, series converges
What is an integral test for convergence and divergence?
⇒ It is used to prove the divergence or convergence of series. This test is called the integral test, which compares an infinite sum to an improper integral. It is important to note that this test can only be applied when we are considering a series whose terms are all positive.
How to know if a series is converging or diverging?
If the limit exists and is a finite number (a number less than infinity), we say the integral converges. If the limit is ±∞ or does not exist, we say the integral diverges.
let aₓ= f (x) is any function
⇒ In order for the integral test to work The function must be positive it has to be continuous and it has to be decreasing when x≥1
If the integral converges it means the series is also converging
If the integral diverges it means the series is also diverging
The sequence is clearly positive and decreases for k∈N then by the integral test,
and
⇒
So it comes with a finite value hence the series converges
Learn more about the integral tests here :
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