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For :
1) Make a guess; even a bad one: 4
2) ½ (4 + 2/4) = 2.25
3) ½(2.25 + 2/2.25) = 1.56
4) Repeat, thereby obtaining: 1.42 , 1.41
1.412 ≈ 2
(from Edwards & Penney: Calculus. New Jersey: Prentice Hall, 2002)
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