Math Problem Statement

Find the minimum number of iterations required by the bisection method to guarantee that you can find the root of a function to within an absolute error of 10^-8 if you know that the root is in the interval (-3, 4).

Solution

To determine the minimum number of iterations required by the bisection method, we use the formula:

Nlog(baϵ)log2N \geq \frac{\log \left( \frac{b - a}{\epsilon} \right)}{\log 2}

Where:

  • NN is the number of iterations,
  • aa and bb are the endpoints of the initial interval [3,4][-3, 4],
  • ϵ\epsilon is the desired error tolerance, which in this case is 10810^{-8}.

Step-by-Step Solution:

  1. The length of the interval is: ba=4(3)=7b - a = 4 - (-3) = 7

  2. The absolute error tolerance is: ϵ=108\epsilon = 10^{-8}

  3. Now, substitute into the formula for the number of iterations: Nlog(7108)log2N \geq \frac{\log \left( \frac{7}{10^{-8}} \right)}{\log 2} Nlog(7×108)log2N \geq \frac{\log (7 \times 10^8)}{\log 2}

  4. Solve for NN.

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In the meantime, here are five related questions to expand your understanding of the bisection method:

  1. What are the advantages of the bisection method compared to other root-finding algorithms?
  2. How does the choice of the initial interval affect the convergence of the bisection method?
  3. Can the bisection method be used to find complex roots? Why or why not?
  4. What happens if the root lies exactly on one of the interval boundaries in the bisection method?
  5. How does the error bound change if the interval length is halved at each step in the bisection method?

Tip: The bisection method always guarantees convergence, but its speed depends on how narrow the interval becomes after each iteration.

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Math Problem Analysis

Mathematical Concepts

Numerical Methods
Root-Finding Algorithms
Error Analysis

Formulas

N ≥ (log((b - a)/ε)) / log(2)
b - a = 4 - (-3) = 7
ε = 10^-8

Theorems

Bisection Method

Suitable Grade Level

Undergraduate