Chapter 6: Problem 15
In \(15-22 :\) a. Write each sum as a series. b. Find the sum of each series. $$ 3+\sum_{n=1}^{5} 3(2)^{n} $$
Short Answer
Expert verified
The sum of the series is 189.
Step by step solution
01
Identify the Series
The given expression is \(3 + \sum_{n=1}^{5} 3(2)^n\). This means there is a constant 3 added to a geometric series where the general term is \(3(2)^n\).
02
Write the Series
Write out the terms in the series from \(n=1\) to \(n=5\). Each term in the series is calculated as \(3(2)^n\):- For \(n=1\), the term is \(3(2)^1 = 6\),- For \(n=2\), the term is \(3(2)^2 = 12\),- For \(n=3\), the term is \(3(2)^3 = 24\),- For \(n=4\), the term is \(3(2)^4 = 48\),- For \(n=5\), the term is \(3(2)^5 = 96\).So, the series is \(3 + 6 + 12 + 24 + 48 + 96\).
03
Calculate the Sum of the Series
Add the terms of the series together:- First, calculate the sum of the series terms except the initial 3: \(6 + 12 + 24 + 48 + 96 = 186\).- Then, add the initial 3 to the sum: \(3 + 186 = 189\).
04
Conclusion
Therefore, the total sum of the series \(3 + \sum_{n=1}^{5} 3(2)^n\) is \(189\).
Unlock Step-by-Step Solutions & Ace Your Exams!
-
Full Textbook Solutions
Get detailed explanations and key concepts
-
Unlimited Al creation
Al flashcards, explanations, exams and more...
-
Ads-free access
To over 500 millions flashcards
-
Money-back guarantee
We refund you if you fail your exam.
Over 30 million students worldwide already upgrade their learning with 91Ó°ÊÓ!
Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Summation
Summation is a way of adding numbers together in a specific order. In mathematical terms, it involves adding a sequence of numbers, often represented as \( \sum \). This symbol, called "sigma," represents the act of summing a series of terms. In our problem, the expression \( \sum_{n=1}^{5} 3(2)^n \) indicates that we will add up each calculated term to get a total sum.
To understand it better, think of summation as a stack of dominoes, where each domino adds a certain value. You keep adding dominoes (or terms) until you reach the top of the stack, which gives you the final sum.
Summation is not just for numbers; it is a powerful tool used in various mathematical concepts, providing a manageable way to handle large amounts of data.
To understand it better, think of summation as a stack of dominoes, where each domino adds a certain value. You keep adding dominoes (or terms) until you reach the top of the stack, which gives you the final sum.
Summation is not just for numbers; it is a powerful tool used in various mathematical concepts, providing a manageable way to handle large amounts of data.
Series Addition
When we talk about series addition, we are referring to the process of summing a sequence of numbers or expressions systematically. In our exercise, the task is to write and then sum each term of a given series.
The series given by \( 3 + \sum_{n=1}^{5} 3(2)^n \) involves adding an initial constant, 3, to a geometric series. Each term in this series is found by multiplying a base number, 3, by powers of another number, 2, such as \( 3(2)^1, 3(2)^2, \) and so on.
The series given by \( 3 + \sum_{n=1}^{5} 3(2)^n \) involves adding an initial constant, 3, to a geometric series. Each term in this series is found by multiplying a base number, 3, by powers of another number, 2, such as \( 3(2)^1, 3(2)^2, \) and so on.
- First, it involves identifying each term based on the given pattern.
- Then, the terms are written out and summed to find the total.
Geometric Sequence
A geometric sequence is a list of numbers where each term after the first is found by multiplying the previous one by a fixed, non-zero number called the "common ratio." In our problem, the sequence involves terms like \( 3(2)^n \), where 2 is the common ratio.
To break it down:
To break it down:
- Start with the initial term, which is determined by multiplying the first term with the common ratio successively.
- Continue this multiplication until all required terms have been generated.
Algebra 2
Algebra 2 expands on the foundations laid in previous algebra courses, delving deeper into powerful mathematical concepts like sequences and series. In this context, we apply Algebra 2 techniques for a more advanced understanding of number sequences, such as a geometric series.
Here’s what involves:
Here’s what involves:
- Manipulating expressions to recognize series patterns, like geometric sequences, and figuring out their sums.
- Utilizing algebraic rules to solve for unknowns or sum up sequences systematically.