19. The figure shows the graph of a function f. Suppose that Newton's method is used to approximate the root r of the equation f(x)=0 with initial approximation x₁ = 1. (a) Draw the tangent lines that are used to find x2 and x3, and estimate the numerical values of x2 and x3. (b) Would x₁ = 5 be a better first approximation? Explain. y 1 0 1 r S X
19. The figure shows the graph of a function f. Suppose that Newton's method is used to approximate the root r of the equation f(x)=0 with initial approximation x₁ = 1. (a) Draw the tangent lines that are used to find x2 and x3, and estimate the numerical values of x2 and x3. (b) Would x₁ = 5 be a better first approximation? Explain. y 1 0 1 r S X
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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**19.** The figure shows the graph of a function \( f \). Suppose that Newton's method is used to approximate the root \( r \) of the equation \( f(x) = 0 \) with initial approximation \( x_1 = 1 \).
**(a)** Draw the tangent lines that are used to find \( x_2 \) and \( x_3 \), and estimate the numerical values of \( x_2 \) and \( x_3 \).
**(b)** Would \( x_1 = 5 \) be a better first approximation? Explain.
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**Graph Explanation:**
The graph below illustrates a function \( f(x) \) with the x and y axes labeled. The curve begins above the x-axis, descends towards and crosses the x-axis at a point \( r \), and then ascends again. The initial approximation point \( x_1 = 1 \) is marked on the x-axis. The root of the function is labeled as \( r \).
- **Grid**: The grid is composed of evenly spaced horizontal and vertical lines, representing a standard Cartesian plane.
- **Curve**: The curve is continuous and smooth, suggesting a polynomial-like behavior.
- **Label \( s \)**: A point \( s \) is labeled further along the x-axis, beyond the root \( r \).
To apply Newton's method, one would draw tangent lines at the chosen points and observe where these tangents intersect the x-axis to approximate the roots \( x_2 \) and \( x_3 \).
The question also asks whether starting with \( x_1 = 5 \) would serve as a better initial approximation for finding the root. This involves examining the curve's behavior near these points and the nature of the tangent line's intersections with the x-axis.
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