Math Problem Statement

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Solve the equation: ⌊√n + √(n+1) + √(n+2)⌋ = ⌊√(9n+8)⌋

Solution

We are given the equation:

n+n+1+n+2=9n+8\left\lfloor \sqrt{n} + \sqrt{n+1} + \sqrt{n+2} \right\rfloor = \left\lfloor \sqrt{9n+8} \right\rfloor

where x\lfloor x \rfloor represents the floor function, which gives the greatest integer less than or equal to xx.

Steps to Solve:

  1. Approximation for Large nn: We need to compare the sum of the square roots on the left-hand side with the square root on the right-hand side for different values of nn. Since both expressions are within a floor function, we can start by calculating them for small values of nn.

  2. Testing for Small nn:

    Let's try substituting small values of nn and check both sides.

    • For n=0n = 0: LHS=0+1+2=0+1+1.414=2.414=2\text{LHS} = \lfloor \sqrt{0} + \sqrt{1} + \sqrt{2} \rfloor = \lfloor 0 + 1 + 1.414 \rfloor = \lfloor 2.414 \rfloor = 2 RHS=9(0)+8=8=2.828=2\text{RHS} = \lfloor \sqrt{9(0) + 8} \rfloor = \lfloor \sqrt{8} \rfloor = \lfloor 2.828 \rfloor = 2 So, the equation holds for n=0n = 0.

    • For n=1n = 1: LHS=1+2+3=1+1.414+1.732=4.146=4\text{LHS} = \lfloor \sqrt{1} + \sqrt{2} + \sqrt{3} \rfloor = \lfloor 1 + 1.414 + 1.732 \rfloor = \lfloor 4.146 \rfloor = 4 RHS=9(1)+8=17=4.123=4\text{RHS} = \lfloor \sqrt{9(1) + 8} \rfloor = \lfloor \sqrt{17} \rfloor = \lfloor 4.123 \rfloor = 4 The equation holds for n=1n = 1 as well.

    • For n=2n = 2: LHS=2+3+4=1.414+1.732+2=5.146=5\text{LHS} = \lfloor \sqrt{2} + \sqrt{3} + \sqrt{4} \rfloor = \lfloor 1.414 + 1.732 + 2 \rfloor = \lfloor 5.146 \rfloor = 5 RHS=9(2)+8=26=5.099=5\text{RHS} = \lfloor \sqrt{9(2) + 8} \rfloor = \lfloor \sqrt{26} \rfloor = \lfloor 5.099 \rfloor = 5 The equation holds for n=2n = 2.

    • For n=3n = 3: LHS=3+4+5=1.732+2+2.236=5.968=5\text{LHS} = \lfloor \sqrt{3} + \sqrt{4} + \sqrt{5} \rfloor = \lfloor 1.732 + 2 + 2.236 \rfloor = \lfloor 5.968 \rfloor = 5 RHS=9(3)+8=35=5.916=5\text{RHS} = \lfloor \sqrt{9(3) + 8} \rfloor = \lfloor \sqrt{35} \rfloor = \lfloor 5.916 \rfloor = 5 The equation holds for n=3n = 3.

    So far, the equation holds for n=0,1,2,3n = 0, 1, 2, 3.

  3. Conclusion: Based on the calculations, the equation appears to be true for the tested values of nn, and it likely holds for larger values of nn as well.

Would you like a more in-depth analysis of how the function behaves for larger nn or any specific questions related to this solution? Let me know if you need further details!

Here are 5 related questions to think about:

  1. What is the general behavior of square root functions for large nn?
  2. How does the floor function affect approximations for continuous functions like square roots?
  3. What other mathematical functions behave similarly to square roots when approximated for small or large values?
  4. Can we generalize this kind of equation for other sequences of square roots?
  5. What would happen if we replaced the floor function with a ceiling function (x\lceil x \rceil)?

Tip: When solving equations involving square roots and the floor function, always check small values first to see if a pattern emerges!

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Math Problem Analysis

Mathematical Concepts

Algebra
Floor Functions
Square Roots

Formulas

Floor Function: ⌊x⌋ gives the largest integer less than or equal to x
Square Root Function: √x is the positive number that, when squared, gives x

Theorems

Floor function properties
Square root approximations

Suitable Grade Level

Grades 9-12