Math Problem Statement

Evaluate the summation \( \sum_{i=3}^{5} (i^3 - 2 + 3i) \).

Solution

This is a summation problem, where you evaluate the sum of the expression i32+3ii^3 - 2 + 3i for ii ranging from 3 to 5.

The formula for this summation is: i=35(i32+3i)=(332+33)+(432+34)+(532+35)\sum_{i=3}^{5} \left( i^3 - 2 + 3i \right) = (3^3 - 2 + 3 \cdot 3) + (4^3 - 2 + 3 \cdot 4) + (5^3 - 2 + 3 \cdot 5)

Step-by-Step Solution:

  1. Evaluate each term individually:

    • For i=3i = 3: 332+33=272+9=343^3 - 2 + 3 \cdot 3 = 27 - 2 + 9 = 34
    • For i=4i = 4: 432+34=642+12=744^3 - 2 + 3 \cdot 4 = 64 - 2 + 12 = 74
    • For i=5i = 5: 532+35=1252+15=1385^3 - 2 + 3 \cdot 5 = 125 - 2 + 15 = 138
  2. Add the results: 34+74+138=24634 + 74 + 138 = 246

Final Answer:

246\boxed{246}

Would you like further clarification or a different approach to this problem?


Here are 5 related questions to explore:

  1. How would the solution change if the summation limits were different (e.g., i=2i = 2 to i=5i = 5)?
  2. Can you write a general formula for summations of cubic terms i=abi3\sum_{i=a}^b i^3?
  3. How would this problem change if the summand had a quadratic term instead of a cubic one?
  4. Can you explain how summation properties (e.g., linearity) can simplify such problems?
  5. What are the practical applications of evaluating summations in real-world problems?

Tip: Always break down summations into individual terms to evaluate them efficiently, especially for small ranges of ii.

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Math Problem Analysis

Mathematical Concepts

Summation
Cubic Expressions
Algebraic Manipulation

Formulas

Summation Formula: \( \sum_{i=a}^b f(i) \)
Cubic Power: \( i^3 \)

Theorems

Linearity of Summation

Suitable Grade Level

Grades 10-12