Hey I have a question about inequalities

  • Thread starter Thread starter MartynaJ
  • Start date Start date
  • Tags Tags
    Hey Inequalities
AI Thread Summary
The discussion revolves around solving an inequality problem involving a polynomial of degree higher than 6, with specified solution intervals: x < -3, 0 < x < 2, and 2 < x < 6. Participants suggest that the original poster (OP) should refer to their textbook and class notes for similar examples. They emphasize the importance of understanding polynomial factors and roots, noting that the roots corresponding to the given intervals should guide the formation of the polynomial. The thread concludes with a reminder that the OP should demonstrate some initial work before seeking further assistance. Overall, the focus is on understanding polynomial inequalities and their solutions.
MartynaJ
Messages
18
Reaction score
1
Poster has been reminded to show their work on schoolwork problems
Homework Statement
Determine a possible inequality question (in any form) with a degree higher than 6 the has the solution: x<-3 or 0<x<2 or 2<x<6. Justify your solution in full detail
Relevant Equations
x<-3 or 0<x<2 or 2<x<6
I am honestly not sure where to start. Please give me a hint on how to solve this problem. Thanks!
 
Physics news on Phys.org
Thread is in Moderation pending approval...
 
MartynaJ said:
Homework Statement:: Determine a possible inequality question (in any form) with a degree higher than 6 the has the solution: x<-3 or 0<x<2 or 2<x<6. Justify your solution in full detail
Relevant Equations:: x<-3 or 0<x<2 or 2<x<6

I am honestly not sure where to start. Please give me a hint on how to solve this problem. Thanks!
What does an inequality with a degree higher than 6 mean in this context? Have you studied that yet? (and if not, why are they asking you this question?)
 
berkeman said:
What does an inequality with a degree higher than 6 mean in this context?
The OP probably has studied polynomials (in factored form), and is asked to solve an inequality something like p(x) > 0, where p(x) is a polynomial of degree >= 6.
 
  • Like
Likes berkeman
Mark44 said:
The OP probably has studied polynomials (in factored form), and is asked to solve an inequality something like p(x) > 0, where p(x) is a polynomial of degree >= 6.
Ya we studied polynomials in factors form, but I am not sure how I can solve this.
 
MartynaJ said:
Ya we studied polynomials in factors form, but I am not sure how I can solve this.
Then I suggest you look at your textbook and class notes to see if there is a similar example.
Given the inequalities x<-3 or 0<x<2 or 2<x<6 , the polynomial will have roots (x-intercepts) at x = -3, x = 0, x = 2, and x = 6. This should suggest what the factors should be.

Since you haven't shown any work in this thread, I am closing it. When you have some idea of what to do, please start a new thread.
 
I tried to combine those 2 formulas but it didn't work. I tried using another case where there are 2 red balls and 2 blue balls only so when combining the formula I got ##\frac{(4-1)!}{2!2!}=\frac{3}{2}## which does not make sense. Is there any formula to calculate cyclic permutation of identical objects or I have to do it by listing all the possibilities? Thanks
Essentially I just have this problem that I'm stuck on, on a sheet about complex numbers: Show that, for ##|r|<1,## $$1+r\cos(x)+r^2\cos(2x)+r^3\cos(3x)...=\frac{1-r\cos(x)}{1-2r\cos(x)+r^2}$$ My first thought was to express it as a geometric series, where the real part of the sum of the series would be the series you see above: $$1+re^{ix}+r^2e^{2ix}+r^3e^{3ix}...$$ The sum of this series is just: $$\frac{(re^{ix})^n-1}{re^{ix} - 1}$$ I'm having some trouble trying to figure out what to...
Back
Top