Evaluate expression W/O Calculator

Click For Summary

Homework Help Overview

The discussion centers around finding the exact value of the expression \(\sqrt[3]{10+6\sqrt{3}}+\sqrt[3]{10-6\sqrt{3}}\). Participants explore various algebraic techniques and identities related to cube roots and binomial expansions.

Discussion Character

  • Exploratory, Mathematical reasoning, Problem interpretation

Approaches and Questions Raised

  • Participants consider factoring methods and identities, questioning how to simplify the expression. Some suggest letting \(x\) represent the expression and finding \(x^3\). Others explore potential values for \(a\) and \(b\) in the context of cubic expansions.

Discussion Status

There is an ongoing exploration of different approaches to expand and simplify the expression. Some participants have provided hints and insights, while others express confusion about specific steps in the process. Multiple interpretations and methods are being discussed without a clear consensus on a single approach.

Contextual Notes

Participants note the importance of recognizing the structure of the expression and the relationships between the terms involved, including the use of the Rational Root Theorem for solving cubic equations. There is acknowledgment of potential complexities in finding the roots of the cubic equation derived from the expression.

  • #31
S.R said:
I didn't notice that; thanks!

x^3-6x-20=0

(x-2)(x^2+2x+10) = 0

The only real solution is x=2.

Yeah, well done! :approve:

EDIT: Small correction: the equation should've been x^3 + 6x - 20 = 0. Small matter, just a typo. :smile:
 

Similar threads

  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K
Replies
8
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 30 ·
2
Replies
30
Views
4K
  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 21 ·
Replies
21
Views
2K
Replies
14
Views
2K
  • · Replies 3 ·
Replies
3
Views
2K