Math Problem Statement

Find the linearization of the function

f(x)=cube root (7+x)

centered at a=1

.

Answer: L(x)=

Use this linearization to approximate cube root (8.06)

.

Answer:

Solution

To find the linearization of the function f(x)=7+x3f(x) = \sqrt[3]{7 + x} centered at a=1a = 1, we first need to calculate f(a)f(a) and f(a)f'(a).

  1. Calculate f(1)f(1): [ f(1) = \sqrt[3]{7 + 1} = \sqrt[3]{8} = 2 ]

  2. Calculate the derivative f(x)f'(x): Using the chain rule: f(x)=13(7+x)23(1)=13(7+x)23f'(x) = \frac{1}{3}(7 + x)^{-\frac{2}{3}} \cdot (1) = \frac{1}{3\sqrt[3]{(7+x)^2}}

  3. Evaluate f(1)f'(1): [ f'(1) = \frac{1}{3\sqrt[3]{(7 + 1)^2}} = \frac{1}{3\sqrt[3]{8^2}} = \frac{1}{3 \cdot 4} = \frac{1}{12} ]

  4. Construct the linearization L(x)L(x): The formula for the linear approximation (linearization) at aa is: L(x)=f(a)+f(a)(xa)L(x) = f(a) + f'(a)(x - a) Substituting the values we found: L(x)=2+112(x1)L(x) = 2 + \frac{1}{12}(x - 1)

So, the linearization is: L(x)=2+112(x1)\boxed{L(x) = 2 + \frac{1}{12}(x - 1)}

Use the linearization to approximate 8.063\sqrt[3]{8.06}:

To approximate 8.063\sqrt[3]{8.06}, we can use the linearization at x=1x = 1:

  1. Substitute x=8.06x = 8.06 into L(x)L(x): L(8.06)=2+112(8.061)L(8.06) = 2 + \frac{1}{12}(8.06 - 1) =2+112(7.06)=2+7.0612= 2 + \frac{1}{12}(7.06) = 2 + \frac{7.06}{12} =2+0.58832.5883= 2 + 0.5883 \approx 2.5883

Thus, the approximation for 8.063\sqrt[3]{8.06} is: 2.5883\boxed{2.5883}

Would you like any details or have any questions? Here are some related questions:

  1. What is the significance of linearization in calculus?
  2. How does the linear approximation compare to the actual value?
  3. Can you find the linearization at a different point, say a=2a = 2?
  4. What would be the effect of using a point further away from a=1a = 1 for linearization?
  5. How do you find the derivative of more complex functions?

Tip: When approximating values, linearization is most accurate for points close to the center of approximation.

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Math Problem Analysis

Mathematical Concepts

Calculus
Linearization
Derivatives

Formulas

L(x) = f(a) + f'(a)(x - a)
f'(x) = 1/3(7 + x)^(-2/3)

Theorems

Linear approximation theorem

Suitable Grade Level

Grades 11-12