/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 16 Find all natural number values f... [FREE SOLUTION] | 91Ó°ÊÓ

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Find all natural number values for \(n\) for which the given statement is false. $$3^{n}>2 n+1$$

Short Answer

Expert verified
The statement is false only for \(n=1\).

Step by step solution

01

- Understand the given statement

The inequality given is \(3^{n} > 2n + 1\). We need to determine for which natural number values of \(n\) this statement is not true.
02

- Test small values of \(n\)

Start by testing small natural number values for \(n\) to find when \(3^{n} gtr 2n+1\).For \(n=1\): \(3^{1} = 3\), \(2 \times 1 + 1 = 3\).So, \(3 > 3\) is false, implying \(n=1\) is invalid.For \(n=2\): \(3^{2} = 9\), \(2 \times 2 + 1 = 5\).So, \(9 > 5\) is true.For \(n=3\): \(3^{3} = 27\), \(2 \times 3 + 1 = 7\).So, \(27 > 7\) is true.
03

- Continue testing to identify the pattern

Keep testing increasing values of \(n\).For \(n=4\): \(3^{4} = 81\), \(2 \times 4 + 1 = 9\).So, \(81 > 9\) is true.It's evident when \(n>1\), \(3^{n}\) grows faster than \(2n+1\). Thus, \(3^{n}\) will always be greater than \(2n+1\) for \(n eq 1\).
04

- Summarize the findings

From the tests, the inequality \(3^{n} > 2n + 1\) is false only when \(n=1\). Therefore, \(n=1\) is the only natural number that makes the statement false.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Natural Numbers
In mathematics, natural numbers are a fundamental concept representing the set of positive integers starting from 1 and moving upwards: 1, 2, 3, and so on. These numbers are crucial for counting, ordering, and basic arithmetic operations. The problem at hand deals specifically with finding natural number values for which a given inequality is false. We start by testing natural numbers one by one to see where the inequality does not hold true.
Exponential vs Linear Growth
Understanding the difference between exponential and linear growth is key to solving the inequality problem.

* Exponential growth: This growth happens more and more rapidly as the value increases. For example, in our problem, the term on the left, \(3^n\), grows exponentially as \(n\) increases.

* Linear growth: This growth happens at a constant rate. For example, the term on the right, \(2n + 1\), increases linearly with \(n\).

By comparing both growth types, you can see that for small values of \(n\), the linear growth may compare closely to the exponential growth. However, as \(n\) increases, the difference becomes more pronounced, with \(3^n\) growing much faster than \(2n + 1\).
Inequality Solutions
Inequality solutions involve finding the values where one expression is greater than, less than, or not equal to another.

To solve the problem:
  • First, we tested small values of \(n\)
  • We noticed that for \(n=1\), the inequality \(3^1 > 2\times1 + 1\) is false because both sides are equal
  • From \(n=2\) onward, we found that \(3^n > 2n + 1\) holds true

This implies that the inequality is false only at \(n=1\), while it holds for all other natural numbers. The process shows how testing different values helps identify patterns and solutions in inequalities.
Mathematical Reasoning
Mathematical reasoning is the backbone of solving equations and inequalities. It involves logical thinking and the ability to justify each step taken towards finding a solution.

Here, we reasoned that:
  • We should test small values to see where the inequality fails
  • Based on our understanding of exponential and linear growth, we predicted that after a certain point, the inequality would hold true
  • Continued testing verified that the inequality holds for all values greater than 1

This approach demonstrates how critical mathematical reasoning helps in breaking down complex problems into manageable steps, ensuring accurate solutions.

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