Computational Mathematics: Finding Roots and Zeros of Functions
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Questions and Answers

What is the main objective of finding the roots of a function using iterative methods?

  • To restrict the interval of the function
  • To find multiple analytical solutions
  • To find exact solutions
  • To obtain good approximations (correct)

Which method iteratively restricts the interval where a continuous function presents a zero?

  • Bisection method (correct)
  • Newton-Raphson method
  • Fixed point method
  • Zeros of functions method

In the bisection method, under what condition does there exist a zero within the interval [a, b]?

  • $f(a)f(b) > 0$
  • $f(a) = f(b)$
  • $f(a) < f(b)$
  • $f(a)f(b) < 0$ (correct)

What type of solutions may be obtained when finding the roots of a function using iterative methods?

<p>Approximate solutions (C)</p> Signup and view all the answers

Which method constructs a sequence of approximations to get closer and closer to the exact solution?

<p>Fixed point method (A)</p> Signup and view all the answers

What does the bisection method rely on to identify the interval where a continuous function presents a zero?

<p>$f(a)f(b) &lt; 0$ (A)</p> Signup and view all the answers

What is the stopping criterion in the bisection algorithm?

<p>Based on the length of the updated interval (B)</p> Signup and view all the answers

In the bisection method, why does the stopping criterion based on |f (c)| > η fail for flat functions?

<p>It is too sensitive to small changes (D)</p> Signup and view all the answers

What does the relative error r(k+1) = |x(k+1) − x(k)| / (|x(k+1)| + 1) represent in the fixed point scheme?

<p>Adjustment factor (D)</p> Signup and view all the answers

Why is the choice of g not unique in the fixed point scheme?

<p>Different choices may converge to the same fixed point (B)</p> Signup and view all the answers

What condition must be satisfied for the fixed point scheme to be effective, according to the Ostrowski theorem?

<p>|g ′ (z)| &lt; 1 (D)</p> Signup and view all the answers

What is the main advantage of the bisection method over other iterative methods?

<p>Guaranteed convergence to the exact root (C)</p> Signup and view all the answers

Why may the bisection method fail in case of multiple roots?

<p>It cannot handle oscillatory functions (C)</p> Signup and view all the answers

What is the significance of choosing a starting point not far away from the sought root in iterative methods?

<p>Prevents overshooting the root (B)</p> Signup and view all the answers

What impact does the condition |f (c)| > η have on flat functions in the bisection method?

<p>It becomes irrelevant for flat functions (C)</p> Signup and view all the answers

What role does the fixed tolerance η play in iterative methods?

<p>Provides a measure for deciding when to stop iterating (C)</p> Signup and view all the answers

What is the main objective of employing iterative approaches in finding the roots of a function?

<p>To obtain good approximations of the function's roots (D)</p> Signup and view all the answers

Under what condition does the bisection method identify an interval where a continuous function presents a zero?

<p>When f(a) * f(b) &lt; 0 (D)</p> Signup and view all the answers

What is the significance of choosing a starting point not far away from the sought root in iterative methods?

<p>It speeds up the convergence of the iterative methods (D)</p> Signup and view all the answers

Why may the bisection method fail in case of multiple roots?

<p>Because it relies on identifying intervals that contain only one root (B)</p> Signup and view all the answers

What does the relative error r(k+1) = |x(k+1) - x(k)| / (|x(k+1)| + 1) represent in the fixed point scheme?

<p>The absolute difference between consecutive approximations (C)</p> Signup and view all the answers

What role does the fixed tolerance η play in iterative methods?

<p>It establishes the limit for acceptable error in approximations (D)</p> Signup and view all the answers

What is the significance of choosing a starting point not far away from the sought root in iterative methods?

<p>It reduces the number of iterations needed to find the root (D)</p> Signup and view all the answers

What does the relative error r(k+1) = |x(k+1) − x(k)| / (|x(k+1)| + 1) represent in the fixed point scheme?

<p>The percentage change in subsequent iterations (A)</p> Signup and view all the answers

What condition must be satisfied for the fixed point scheme to be effective, according to the Ostrowski theorem?

<p>|g ′ (z)| &lt; 1 (A)</p> Signup and view all the answers

Which method iteratively restricts the interval where a continuous function presents a zero?

<p>Bisection method (A)</p> Signup and view all the answers

Why may the bisection method fail in case of multiple roots?

<p>It may converge to an incorrect root (D)</p> Signup and view all the answers

What impact does the condition |f (c)| > η have on flat functions in the bisection method?

<p>It causes the bisection method to fail for flat functions (A)</p> Signup and view all the answers

What type of solutions may be obtained when finding the roots of a function using iterative methods?

<p>Both real and complex solutions (A)</p> Signup and view all the answers

What does the bisection method rely on to identify the interval where a continuous function presents a zero?

<p>The product of function values at interval endpoints being negative (B)</p> Signup and view all the answers

Why is the choice of g not unique in the fixed point scheme?

<p>Different choices of g can lead to different convergence rates (D)</p> Signup and view all the answers

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