Math Problem Statement

Give a big-O estimate for each of these functions. Use a simple function in the big-O estimate: (a) 3n + n^3 + 4. (b) 1 + 2 + 3 + ... + n. (c) log10(2^n) + 10^10 * n^2.

Solution

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Q5 [15 marks]

You are asked to give a Big-O estimate for the following functions:

(a) 3n+33+43n + 3^3 + 4

(b) 1+2434×n1 + 2434 \times n

(c) log10(2n)+10!×n2\log_{10}(2^n) + 10! \times n^2

I will now calculate the Big-O for each of these.


Solution:

(a) 3n+33+43n + 3^3 + 4

  • Simplification: 33=273^3 = 27, so the expression becomes: 3n+27+4=3n+313n + 27 + 4 = 3n + 31
  • Big-O Estimate: The highest degree term is 3n3n, so the Big-O estimate is: O(n)O(n)

(b) 1+2434×n1 + 2434 \times n

  • Simplification: The constant 1 becomes insignificant as nn grows large, so the expression simplifies to: 2434n2434n
  • Big-O Estimate: The highest degree term is 2434n2434n, so the Big-O estimate is: O(n)O(n)

(c) log10(2n)+10!×n2\log_{10}(2^n) + 10! \times n^2

  • Simplification:

    • log10(2n)\log_{10}(2^n) can be simplified using the logarithmic property logb(xy)=ylogb(x)\log_{b}(x^y) = y \log_b(x): log10(2n)=nlog10(2)\log_{10}(2^n) = n \log_{10}(2) The logarith of 2 is a constant, so this term simplifies to O(n)O(n).
    • 10!×n210! \times n^2 is a constant multiplied by n2n^2, so it simplifies to O(n2)O(n^2).
  • Big-O Estimate: The highest degree term is 10!×n210! \times n^2, so the Big-O estimate is: O(n2)O(n^2)


Final Answers:

  • (a) O(n)O(n)
  • (b) O(n)O(n)
  • (c) O(n2)O(n^2)

Would you like further explanations or clarifications on any of these steps? Here are some related questions for you:

  1. What is the difference between Big-O and Big-Theta notation?
  2. How do we handle constants when simplifying a function for Big-O analysis?
  3. What is the importance of the highest degree term in Big-O estimation?
  4. Could there be cases where logarithmic terms impact Big-O estimates significantly?
  5. Can we combine different types of functions (e.g., polynomial and logarithmic) in Big-O notation?

Tip: When calculating Big-O for polynomials and logarithmic functions, always focus on the highest degree term, as this dominates the behavior for large inputs.

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Math Problem Analysis

Mathematical Concepts

Big-O Notation
Polynomials
Logarithms

Formulas

Big-O for a polynomial: O(highest degree term)
Sum of the first n integers: n(n+1)/2
Logarithmic property: log_b(x^y) = y * log_b(x)

Theorems

Big-O Definition

Suitable Grade Level

Undergraduate (Year 1-2)