Prove: if a function is linear for example F(x) = 3x + 3, then after one iteration of Newton's method I can find the x-value such that F(x) = 0. In this case, after one iteration x = -1.

tamkieuqf

tamkieuqf

Answered question

2022-08-09

Prove: if a function is linear for example F ( x ) = 3 x + 3, then after one iteration of Newton's method I can find the x-value such that F ( x ) = 0. In this case, after one iteration x = 1.

Answer & Explanation

Rowan Dyer

Rowan Dyer

Beginner2022-08-10Added 14 answers

Usual setup for Newton's method:
f ( x 0 ) = lim x x 0 f ( x ) f ( x 0 ) x x 0
Look for intersections, i.e. f ( x ) = 0:
x = x 0 f ( x 0 ) f ( x 0 )
Now stray from the general case and suppose f ( x ) is linear, as in f ( x ) = m x + b, so f ( x ) = m. Then,
x = x 0 m x 0 + b m = x 0 x 0 b m = b m
and you have just b / m after one iteration.

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