Expression 7: "x" Subscript, 4 , Baseline equals "x" Subscript, 3 , Baseline minus StartFraction, "f" left parenthesis, "x" Subscript, 3 , Baseline , right parenthesis Over "f" prime left parenthesis, "x" Subscript, 3 , Baseline , right parenthesis , EndFractionx4=x3−fx3f′x3
equals=
0.9 9 9 0 2 9 3 4 4 2 2 20.999029344222
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Below you can see the construction of each tangent line, which is the function we set equal to 0 at each stage to solve for the next guess.
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First iteration
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Second iteration
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Third iteration
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Fourth iteration
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When the initial guess is large, the iteration enters a stable infinite loop that will never converge to the true solution.
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left parenthesis, 0.3 , 0 , right parenthesis0.3,0
left parenthesis, 0.3 , 1.2 5 0 2 1 3 , right parenthesis0.3,1.250213
left parenthesis, negative 0.5 3 4 6 6 , 0 , right parenthesis−0.53466,0
left parenthesis, negative 0.5 3 4 6 6 , negative 1.5 2 9 8 9 6 , right parenthesis−0.53466,−1.529896
left parenthesis, 0.9 2 5 6 6 , 0 , right parenthesis0.92566,0
left parenthesis, 0.9 2 5 6 6 , 1.9 2 5 5 6 6 , right parenthesis0.92566,1.925566
left parenthesis, negative 0.9 9 8 0 7 , 0 , right parenthesis−0.99807,0
left parenthesis, negative 0.9 9 8 0 7 , negative 1.9 9 8 0 2 1 , right parenthesis−0.99807,−1.998021