Math Problem Statement

f(x)=6{{x}^{4}}+2{{x}^{3}}What is the coefficient for the term containing [(x+1)^2] in the Taylor polynomial, centered at [x=-1], of [f]?

Choose 1 answer:

Choose 1 answer:

(Choice A)   

[30]

A

[30]

(Choice B)   

[60]

B

[60]

(Choice C)   

[42]

C

[42]

(Choice D)   

[20]

D

[20]

Solution

To find the coefficient of the term containing (x+1)2(x+1)^2 in the Taylor polynomial of f(x)=6x4+2x3f(x) = 6x^4 + 2x^3 centered at x=1x = -1, we need to compute the second derivative of f(x)f(x) and evaluate it at x=1x = -1.

Step 1: Compute the first and second derivatives of f(x)f(x)

The function is: f(x)=6x4+2x3f(x) = 6x^4 + 2x^3

First derivative: f(x)=ddx(6x4+2x3)=24x3+6x2f'(x) = \frac{d}{dx}\left(6x^4 + 2x^3\right) = 24x^3 + 6x^2

Second derivative: f(x)=ddx(24x3+6x2)=72x2+12xf''(x) = \frac{d}{dx}\left(24x^3 + 6x^2\right) = 72x^2 + 12x

Step 2: Evaluate the second derivative at x=1x = -1

Substitute x=1x = -1 into f(x)f''(x): f(1)=72(1)2+12(1)=72(1)12=7212=60f''(-1) = 72(-1)^2 + 12(-1) = 72(1) - 12 = 72 - 12 = 60

Step 3: Use the Taylor series formula

The coefficient of the (x+1)2(x + 1)^2 term in the Taylor polynomial is given by: f(1)2!\frac{f''(-1)}{2!}

Since f(1)=60f''(-1) = 60 and 2!=22! = 2, the coefficient is: 602=30\frac{60}{2} = 30

Final Answer

The coefficient for the term containing (x+1)2(x+1)^2 is:

(Choice A) 30

Would you like more details or have any questions? Here are 5 related questions that could further your understanding:

  1. How do you find the general formula for the nth term in a Taylor series?
  2. What is the significance of centering a Taylor series at a point x=ax = a?
  3. How do higher-order derivatives affect the accuracy of a Taylor polynomial?
  4. Can you calculate the Taylor series of f(x)f(x) centered at a different point, such as x=0x = 0?
  5. What happens if we center the Taylor series at a point where the function or its derivatives are undefined?

Tip: Always ensure that you evaluate derivatives carefully at the point of expansion when calculating Taylor series coefficients.

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Math Problem Analysis

Mathematical Concepts

Taylor series
Derivatives

Formulas

Taylor series formula

Theorems

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Suitable Grade Level

Advanced High School