\(\text{www.the}\beta\text{etafunction.com}\)
Home
Login
Questions: Algebra BusinessCalculus
Please login to create an exam or a quiz.
Use Newton's method to find the first 5 approximations of the solution to the equation \(\displaystyle \cos{\left(x \right)}= \frac{639 x^{3}}{1000} - 7\) using \(\displaystyle x_0=3\).
Using the formula for Newton's method gives \begin{equation*}x_{n+1} = x_{n} - \frac{- \frac{639 x_{n}^{3}}{1000} + \cos{\left(x_{n} \right)} + 7}{- \frac{1917 x_{n}^{2}}{1000} - \sin{\left(x_{n} \right)}} \end{equation*} Using \(\displaystyle x_0 = 3\) and \(\displaystyle n = 0,1,2,3,\) and \(\displaystyle 4\) gives: \begin{equation*}x_{1} = (3.0000000000) - \frac{- \frac{639 (3.0000000000)^{3}}{1000} + \cos{\left((3.0000000000) \right)} + 7}{- \frac{1917 (3.0000000000)^{2}}{1000} - \sin{\left((3.0000000000) \right)}} = 2.3536325786\end{equation*} \begin{equation*}x_{2} = (2.3536325786) - \frac{- \frac{639 (2.3536325786)^{3}}{1000} + \cos{\left((2.3536325786) \right)} + 7}{- \frac{1917 (2.3536325786)^{2}}{1000} - \sin{\left((2.3536325786) \right)}} = 2.1738464889\end{equation*} \begin{equation*}x_{3} = (2.1738464889) - \frac{- \frac{639 (2.1738464889)^{3}}{1000} + \cos{\left((2.1738464889) \right)} + 7}{- \frac{1917 (2.1738464889)^{2}}{1000} - \sin{\left((2.1738464889) \right)}} = 2.1605460485\end{equation*} \begin{equation*}x_{4} = (2.1605460485) - \frac{- \frac{639 (2.1605460485)^{3}}{1000} + \cos{\left((2.1605460485) \right)} + 7}{- \frac{1917 (2.1605460485)^{2}}{1000} - \sin{\left((2.1605460485) \right)}} = 2.1604759174\end{equation*} \begin{equation*}x_{5} = (2.1604759174) - \frac{- \frac{639 (2.1604759174)^{3}}{1000} + \cos{\left((2.1604759174) \right)} + 7}{- \frac{1917 (2.1604759174)^{2}}{1000} - \sin{\left((2.1604759174) \right)}} = 2.1604759155\end{equation*}
\begin{question}Use Newton's method to find the first 5 approximations of the solution to the equation $\cos{\left(x \right)}= \frac{639 x^{3}}{1000} - 7$ using $x_0=3$.
\soln{9cm}{Using the formula for Newton's method gives
\begin{equation*}x_{n+1} = x_{n} - \frac{- \frac{639 x_{n}^{3}}{1000} + \cos{\left(x_{n} \right)} + 7}{- \frac{1917 x_{n}^{2}}{1000} - \sin{\left(x_{n} \right)}} \end{equation*}
Using $x_0 = 3$ and $n = 0,1,2,3,$ and $4$ gives:
\begin{equation*}x_{1} = (3.0000000000) - \frac{- \frac{639 (3.0000000000)^{3}}{1000} + \cos{\left((3.0000000000) \right)} + 7}{- \frac{1917 (3.0000000000)^{2}}{1000} - \sin{\left((3.0000000000) \right)}} = 2.3536325786\end{equation*}
\begin{equation*}x_{2} = (2.3536325786) - \frac{- \frac{639 (2.3536325786)^{3}}{1000} + \cos{\left((2.3536325786) \right)} + 7}{- \frac{1917 (2.3536325786)^{2}}{1000} - \sin{\left((2.3536325786) \right)}} = 2.1738464889\end{equation*}
\begin{equation*}x_{3} = (2.1738464889) - \frac{- \frac{639 (2.1738464889)^{3}}{1000} + \cos{\left((2.1738464889) \right)} + 7}{- \frac{1917 (2.1738464889)^{2}}{1000} - \sin{\left((2.1738464889) \right)}} = 2.1605460485\end{equation*}
\begin{equation*}x_{4} = (2.1605460485) - \frac{- \frac{639 (2.1605460485)^{3}}{1000} + \cos{\left((2.1605460485) \right)} + 7}{- \frac{1917 (2.1605460485)^{2}}{1000} - \sin{\left((2.1605460485) \right)}} = 2.1604759174\end{equation*}
\begin{equation*}x_{5} = (2.1604759174) - \frac{- \frac{639 (2.1604759174)^{3}}{1000} + \cos{\left((2.1604759174) \right)} + 7}{- \frac{1917 (2.1604759174)^{2}}{1000} - \sin{\left((2.1604759174) \right)}} = 2.1604759155\end{equation*}
}
\end{question}
\documentclass{article}
\usepackage{tikz}
\usepackage{amsmath}
\usepackage[margin=2cm]{geometry}
\usepackage{tcolorbox}
\newcounter{ExamNumber}
\newcounter{questioncount}
\stepcounter{questioncount}
\newenvironment{question}{{\noindent\bfseries Question \arabic{questioncount}.}}{\stepcounter{questioncount}}
\renewcommand{\labelenumi}{{\bfseries (\alph{enumi})}}
\newif\ifShowSolution
\newcommand{\soln}[2]{%
\ifShowSolution%
\noindent\begin{tcolorbox}[colframe=blue,title=Solution]#2\end{tcolorbox}\else%
\vspace{#1}%
\fi%
}%
\newcommand{\hideifShowSolution}[1]{%
\ifShowSolution%
%
\else%
#1%
\fi%
}%
\everymath{\displaystyle}
\ShowSolutiontrue
\begin{document}\begin{question}(10pts) The question goes here!
\soln{9cm}{The solution goes here.}
\end{question}\end{document}<p> <p>Use Newton's method to find the first 5 approximations of the solution to the equation <img class="equation_image" title=" \displaystyle \cos{\left(x \right)}= \frac{639 x^{3}}{1000} - 7 " src="/equation_images/%20%5Cdisplaystyle%20%5Ccos%7B%5Cleft%28x%20%5Cright%29%7D%3D%20%5Cfrac%7B639%20x%5E%7B3%7D%7D%7B1000%7D%20-%207%20" alt="LaTeX: \displaystyle \cos{\left(x \right)}= \frac{639 x^{3}}{1000} - 7 " data-equation-content=" \displaystyle \cos{\left(x \right)}= \frac{639 x^{3}}{1000} - 7 " /> using <img class="equation_image" title=" \displaystyle x_0=3 " src="/equation_images/%20%5Cdisplaystyle%20x_0%3D3%20" alt="LaTeX: \displaystyle x_0=3 " data-equation-content=" \displaystyle x_0=3 " /> . </p> </p><p> <p>Using the formula for Newton's method gives
<img class="equation_image" title=" x_{n+1} = x_{n} - \frac{- \frac{639 x_{n}^{3}}{1000} + \cos{\left(x_{n} \right)} + 7}{- \frac{1917 x_{n}^{2}}{1000} - \sin{\left(x_{n} \right)}} " src="/equation_images/%20x_%7Bn%2B1%7D%20%3D%20%20x_%7Bn%7D%20-%20%5Cfrac%7B-%20%5Cfrac%7B639%20x_%7Bn%7D%5E%7B3%7D%7D%7B1000%7D%20%2B%20%5Ccos%7B%5Cleft%28x_%7Bn%7D%20%5Cright%29%7D%20%2B%207%7D%7B-%20%5Cfrac%7B1917%20x_%7Bn%7D%5E%7B2%7D%7D%7B1000%7D%20-%20%5Csin%7B%5Cleft%28x_%7Bn%7D%20%5Cright%29%7D%7D%20%20%20" alt="LaTeX: x_{n+1} = x_{n} - \frac{- \frac{639 x_{n}^{3}}{1000} + \cos{\left(x_{n} \right)} + 7}{- \frac{1917 x_{n}^{2}}{1000} - \sin{\left(x_{n} \right)}} " data-equation-content=" x_{n+1} = x_{n} - \frac{- \frac{639 x_{n}^{3}}{1000} + \cos{\left(x_{n} \right)} + 7}{- \frac{1917 x_{n}^{2}}{1000} - \sin{\left(x_{n} \right)}} " />
Using <img class="equation_image" title=" \displaystyle x_0 = 3 " src="/equation_images/%20%5Cdisplaystyle%20x_0%20%3D%203%20" alt="LaTeX: \displaystyle x_0 = 3 " data-equation-content=" \displaystyle x_0 = 3 " /> and <img class="equation_image" title=" \displaystyle n = 0,1,2,3, " src="/equation_images/%20%5Cdisplaystyle%20n%20%3D%200%2C1%2C2%2C3%2C%20" alt="LaTeX: \displaystyle n = 0,1,2,3, " data-equation-content=" \displaystyle n = 0,1,2,3, " /> and <img class="equation_image" title=" \displaystyle 4 " src="/equation_images/%20%5Cdisplaystyle%204%20" alt="LaTeX: \displaystyle 4 " data-equation-content=" \displaystyle 4 " /> gives:
<img class="equation_image" title=" x_{1} = (3.0000000000) - \frac{- \frac{639 (3.0000000000)^{3}}{1000} + \cos{\left((3.0000000000) \right)} + 7}{- \frac{1917 (3.0000000000)^{2}}{1000} - \sin{\left((3.0000000000) \right)}} = 2.3536325786 " src="/equation_images/%20x_%7B1%7D%20%3D%20%20%283.0000000000%29%20-%20%5Cfrac%7B-%20%5Cfrac%7B639%20%283.0000000000%29%5E%7B3%7D%7D%7B1000%7D%20%2B%20%5Ccos%7B%5Cleft%28%283.0000000000%29%20%5Cright%29%7D%20%2B%207%7D%7B-%20%5Cfrac%7B1917%20%283.0000000000%29%5E%7B2%7D%7D%7B1000%7D%20-%20%5Csin%7B%5Cleft%28%283.0000000000%29%20%5Cright%29%7D%7D%20%3D%202.3536325786%20" alt="LaTeX: x_{1} = (3.0000000000) - \frac{- \frac{639 (3.0000000000)^{3}}{1000} + \cos{\left((3.0000000000) \right)} + 7}{- \frac{1917 (3.0000000000)^{2}}{1000} - \sin{\left((3.0000000000) \right)}} = 2.3536325786 " data-equation-content=" x_{1} = (3.0000000000) - \frac{- \frac{639 (3.0000000000)^{3}}{1000} + \cos{\left((3.0000000000) \right)} + 7}{- \frac{1917 (3.0000000000)^{2}}{1000} - \sin{\left((3.0000000000) \right)}} = 2.3536325786 " />
<img class="equation_image" title=" x_{2} = (2.3536325786) - \frac{- \frac{639 (2.3536325786)^{3}}{1000} + \cos{\left((2.3536325786) \right)} + 7}{- \frac{1917 (2.3536325786)^{2}}{1000} - \sin{\left((2.3536325786) \right)}} = 2.1738464889 " src="/equation_images/%20x_%7B2%7D%20%3D%20%20%282.3536325786%29%20-%20%5Cfrac%7B-%20%5Cfrac%7B639%20%282.3536325786%29%5E%7B3%7D%7D%7B1000%7D%20%2B%20%5Ccos%7B%5Cleft%28%282.3536325786%29%20%5Cright%29%7D%20%2B%207%7D%7B-%20%5Cfrac%7B1917%20%282.3536325786%29%5E%7B2%7D%7D%7B1000%7D%20-%20%5Csin%7B%5Cleft%28%282.3536325786%29%20%5Cright%29%7D%7D%20%3D%202.1738464889%20" alt="LaTeX: x_{2} = (2.3536325786) - \frac{- \frac{639 (2.3536325786)^{3}}{1000} + \cos{\left((2.3536325786) \right)} + 7}{- \frac{1917 (2.3536325786)^{2}}{1000} - \sin{\left((2.3536325786) \right)}} = 2.1738464889 " data-equation-content=" x_{2} = (2.3536325786) - \frac{- \frac{639 (2.3536325786)^{3}}{1000} + \cos{\left((2.3536325786) \right)} + 7}{- \frac{1917 (2.3536325786)^{2}}{1000} - \sin{\left((2.3536325786) \right)}} = 2.1738464889 " />
<img class="equation_image" title=" x_{3} = (2.1738464889) - \frac{- \frac{639 (2.1738464889)^{3}}{1000} + \cos{\left((2.1738464889) \right)} + 7}{- \frac{1917 (2.1738464889)^{2}}{1000} - \sin{\left((2.1738464889) \right)}} = 2.1605460485 " src="/equation_images/%20x_%7B3%7D%20%3D%20%20%282.1738464889%29%20-%20%5Cfrac%7B-%20%5Cfrac%7B639%20%282.1738464889%29%5E%7B3%7D%7D%7B1000%7D%20%2B%20%5Ccos%7B%5Cleft%28%282.1738464889%29%20%5Cright%29%7D%20%2B%207%7D%7B-%20%5Cfrac%7B1917%20%282.1738464889%29%5E%7B2%7D%7D%7B1000%7D%20-%20%5Csin%7B%5Cleft%28%282.1738464889%29%20%5Cright%29%7D%7D%20%3D%202.1605460485%20" alt="LaTeX: x_{3} = (2.1738464889) - \frac{- \frac{639 (2.1738464889)^{3}}{1000} + \cos{\left((2.1738464889) \right)} + 7}{- \frac{1917 (2.1738464889)^{2}}{1000} - \sin{\left((2.1738464889) \right)}} = 2.1605460485 " data-equation-content=" x_{3} = (2.1738464889) - \frac{- \frac{639 (2.1738464889)^{3}}{1000} + \cos{\left((2.1738464889) \right)} + 7}{- \frac{1917 (2.1738464889)^{2}}{1000} - \sin{\left((2.1738464889) \right)}} = 2.1605460485 " />
<img class="equation_image" title=" x_{4} = (2.1605460485) - \frac{- \frac{639 (2.1605460485)^{3}}{1000} + \cos{\left((2.1605460485) \right)} + 7}{- \frac{1917 (2.1605460485)^{2}}{1000} - \sin{\left((2.1605460485) \right)}} = 2.1604759174 " src="/equation_images/%20x_%7B4%7D%20%3D%20%20%282.1605460485%29%20-%20%5Cfrac%7B-%20%5Cfrac%7B639%20%282.1605460485%29%5E%7B3%7D%7D%7B1000%7D%20%2B%20%5Ccos%7B%5Cleft%28%282.1605460485%29%20%5Cright%29%7D%20%2B%207%7D%7B-%20%5Cfrac%7B1917%20%282.1605460485%29%5E%7B2%7D%7D%7B1000%7D%20-%20%5Csin%7B%5Cleft%28%282.1605460485%29%20%5Cright%29%7D%7D%20%3D%202.1604759174%20" alt="LaTeX: x_{4} = (2.1605460485) - \frac{- \frac{639 (2.1605460485)^{3}}{1000} + \cos{\left((2.1605460485) \right)} + 7}{- \frac{1917 (2.1605460485)^{2}}{1000} - \sin{\left((2.1605460485) \right)}} = 2.1604759174 " data-equation-content=" x_{4} = (2.1605460485) - \frac{- \frac{639 (2.1605460485)^{3}}{1000} + \cos{\left((2.1605460485) \right)} + 7}{- \frac{1917 (2.1605460485)^{2}}{1000} - \sin{\left((2.1605460485) \right)}} = 2.1604759174 " />
<img class="equation_image" title=" x_{5} = (2.1604759174) - \frac{- \frac{639 (2.1604759174)^{3}}{1000} + \cos{\left((2.1604759174) \right)} + 7}{- \frac{1917 (2.1604759174)^{2}}{1000} - \sin{\left((2.1604759174) \right)}} = 2.1604759155 " src="/equation_images/%20x_%7B5%7D%20%3D%20%20%282.1604759174%29%20-%20%5Cfrac%7B-%20%5Cfrac%7B639%20%282.1604759174%29%5E%7B3%7D%7D%7B1000%7D%20%2B%20%5Ccos%7B%5Cleft%28%282.1604759174%29%20%5Cright%29%7D%20%2B%207%7D%7B-%20%5Cfrac%7B1917%20%282.1604759174%29%5E%7B2%7D%7D%7B1000%7D%20-%20%5Csin%7B%5Cleft%28%282.1604759174%29%20%5Cright%29%7D%7D%20%3D%202.1604759155%20" alt="LaTeX: x_{5} = (2.1604759174) - \frac{- \frac{639 (2.1604759174)^{3}}{1000} + \cos{\left((2.1604759174) \right)} + 7}{- \frac{1917 (2.1604759174)^{2}}{1000} - \sin{\left((2.1604759174) \right)}} = 2.1604759155 " data-equation-content=" x_{5} = (2.1604759174) - \frac{- \frac{639 (2.1604759174)^{3}}{1000} + \cos{\left((2.1604759174) \right)} + 7}{- \frac{1917 (2.1604759174)^{2}}{1000} - \sin{\left((2.1604759174) \right)}} = 2.1604759155 " />
</p> </p>