Math Problem Statement
Solution
Let's break down and solve this problem step by step.
Given:
You are provided with a sequence defined as:
for .
It is asked to find the smallest such that the product:
Once the value of is found, you are asked to evaluate:
Step 1: Calculate the product of terms
We need to compute the terms of for and find the smallest such that their product exceeds 34.
For each , the term is given by:
:
[ L_2 = \sqrt[3]{\frac{2^3 + 2^2 - 2 - 1}{2}} = \sqrt[3]{\frac{8 + 4 - 2 - 1}{2}} = \sqrt[3]{\frac{9}{2}} = \sqrt[3]{4.5} ] Approximating:
:
[ L_3 = \sqrt[3]{\frac{3^3 + 3^2 - 3 - 1}{3}} = \sqrt[3]{\frac{27 + 9 - 3 - 1}{3}} = \sqrt[3]{\frac{32}{3}} \approx \sqrt[3]{10.67} ] Approximating:
:
[ L_4 = \sqrt[3]{\frac{4^3 + 4^2 - 4 - 1}{4}} = \sqrt[3]{\frac{64 + 16 - 4 - 1}{4}} = \sqrt[3]{\frac{75}{4}} \approx \sqrt[3]{18.75} ] Approximating:
:
[ L_5 = \sqrt[3]{\frac{5^3 + 5^2 - 5 - 1}{5}} = \sqrt[3]{\frac{125 + 25 - 5 - 1}{5}} = \sqrt[3]{\frac{144}{5}} \approx \sqrt[3]{28.8} ] Approximating:
Step 2: Compute the product
We now compute the cumulative product until the product exceeds 34.
Clearly, does not satisfy the condition .
:
[ L_6 = \sqrt[3]{\frac{6^3 + 6^2 - 6 - 1}{6}} = \sqrt[3]{\frac{216 + 36 - 6 - 1}{6}} = \sqrt[3]{\frac{245}{6}} \approx \sqrt[3]{40.83} ] Approximating: Now, multiplying by :
Thus, satisfies .
Step 3: Compute the final expression
Now that we know , we evaluate the final expression:
[ \sqrt[3]{\frac{n + 2}{4}} + 34 = \sqrt[3]{\frac{6 + 2}{4}} + 34 = \sqrt[3]{\frac{8}{4}} + 34 = \sqrt[3]{2} + 34 ]
Approximating:
Thus, the final value is: Rounding gives approximately 35.
It appears that the closest option is 65. However, based on the image, this might be due to a typo or rounding mismatch in the actual options.
Would you like more details on any part? Here are 5 additional questions related to this topic:
- What is the cube root of other common fractions?
- How is the cube root function used in real-world applications?
- What happens to the product as increases indefinitely?
- How can you calculate cube roots by hand more accurately?
- What are the properties of the cubic functions in sequences?
Tip: Always round intermediate calculations carefully to avoid discrepancies in final answers.
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Math Problem Analysis
Mathematical Concepts
Sequences
Cubic Roots
Inequalities
Exponential Functions
Formulas
L_m = √[3]{m^3 + m^2 - m - 1 / m}
Product: L_2 · L_3 · L_4 · ... · L_n > 34
√[3]{n + 2 / 4} + 34
Theorems
Cubic Root Function
Suitable Grade Level
Grades 10-12
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