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Consider the following equation. 3 x 4 8 x 3 + 5 = 0, [2, 3] (a) Explain how we know that the given equation
Consider the following equation.
3x4 8x3 + 5 = 0, [2, 3]
(a) Explain how we know that the given equation must have a root in the given interval.Let
f(x) = 3x4 8x3 + 5.
The polynomial f is continuous on [2, 3],
f(2) = < 0,
and
f(3) = > 0,
so by the Intermediate Value Theorem, there is a number c in (2, 3) such that
f(c) = .
In other words, the equation
3x4 8x3 + 5 = 0
has a root in [2, 3]. (b) Use Newton's method to approximate the root correct to six decimal places.
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