2 years ago

Solve number 11 pls

Mathematics

1 answer:

Cerrena [4.2K]2 years ago

5 0

Answer:

b. x = 123

Step-by-step explanation:

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Determine the radius of convergence of the following power series. Then test the endpoints to determine the interval of converge

tresset_1 [31]

Answer:

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and,

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Step-by-step explanation:

Given function : Σ(21x)^k

Now,

Using the ratio test, we have

R = $\lim_{n \to \infty} |\frac{21x^{k+1}}{21x^{k}}|$

R = $\lim_{n \to \infty} |\frac{21x^{k}\times21x^{1}}{21x^{k}}|$

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now,

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Therefore,

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and,

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