Question #111660
Find a root of the equation 3x^3+10x^2+10x+7 = 0 which is close to −2.0, using
the Berge -Vieta method. Perform two iterations of the method.
1
Expert's answer
2020-04-28T14:48:14-0400

At the first step of any iteration of the Birge-Vieta method, we write down the coefficients of the equation and put that

b0=a0;

c0=a0.

Also, we have the initial approximation p0=-2.

Second step: find a coefficient


bi=ai+p0bi1.b_i=a_i+p_0⋅b_{i-1}.

Third step: find


ci=bi+p0ci1.c_i=b_i+p_0⋅c_{i-1}.

Fourth step: find


p1=p0bnci1.p_1=p_0-\frac{b_n}{c_{i-1}}.

Fifth step: when


p1p0ϵ,|p_1-p_0|≤\epsilon,


we found the answer.


It is better to arrange the coefficients in the form of a table. Therefore, at the first iteration we have



and


p1=p0b3c2=236=2.5.p_1=p_0-\frac{b_3}{c_2}=-2-\frac{3}{6}=-2.5.

The second iteration gives



and


p2=p1b3c2=2.52.37516.25=2.3539.p_2=p_1-\frac{b_3}{c_2}=-2.5-\frac{-2.375}{16.25}=-2.3539.

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