Use Newton’s Method to show that the equation xn+1 = xn(2 − axn) can be used to approximate 1/a when x1 is an initial guess of the reciprocal of a. Note that this method of approximating reciprocals uses only the operations of multiplication and subtraction.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
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Chapter2: Equations And Inequalities
Section2.1: Equations
Problem 76E
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Use Newton’s Method to show that the equation xn+1 = xn(2 − axn) can be used to approximate 1/a when x1 is an initial guess of the reciprocal of a. Note that this method of approximating reciprocals uses only the operations of multiplication and subtraction.

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