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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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376 Approximate Calculations (Ch. 10<br />

3137. Given a table of the quantities x and y<br />

Compute the values of y for x = 0.5 and for x 2: a) by means<br />

of l<strong>in</strong>ear <strong>in</strong>terpolation; b) by Lagrange's formula.<br />

Sec. 3. Comput<strong>in</strong>g the Real Roots of Equations<br />

1. Establish<strong>in</strong>g <strong>in</strong>itial approximations of roots. The approximation of the<br />

roots of a given equation<br />

/(*)=0 (i)<br />

consists of two stages: 1) separat<strong>in</strong>g the roots, that is, establish<strong>in</strong>g the <strong>in</strong>tervals<br />

(as small as possible) with<strong>in</strong> which lies one and only one root of equation<br />

(1); 2) comput<strong>in</strong>g the roots to a given degree of accuracy<br />

If a function /(A) is def<strong>in</strong>ed and cont<strong>in</strong>uous on an <strong>in</strong>terval [a, b] and<br />

/(a)./(6)

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