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 July 12th, 2019, 08:57 PM #1 Member   Joined: Aug 2018 From: România Posts: 88 Thanks: 6 A grade three equation Hello all, Solve the equation $\displaystyle x^3-\{x \}^2+i[x]-1=0$ where $\displaystyle i^2=-1$. All the best, Integrator July 13th, 2019, 02:56 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,969 Thanks: 2219 What do $\{x\}$ and $[x]$ mean in your equation? July 13th, 2019, 07:49 AM #3 Senior Member   Joined: Feb 2016 From: Australia Posts: 1,838 Thanks: 653 Math Focus: Yet to find out. That’s some smart 3rd graders Thanks from SDK and Greens July 13th, 2019, 01:11 PM   #4
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 Originally Posted by Joppy That’s some smart 3rd graders
I assumed they meant 3rd-order. I can give you the engineering solution (attached).
Attached Images 3rdOrder.png (16.3 KB, 1 views) July 13th, 2019, 10:03 PM   #5
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 Originally Posted by skipjack What do $\{x\}$ and $[x]$ mean in your equation?
Hello,

$\displaystyle x=[x]+\{x\}$.Par exemple $\displaystyle [-3.7]=-4$ and $\displaystyle \{-3.7\}=0.3$.

All the best,

Integrator

Last edited by Integrator; July 13th, 2019 at 10:11 PM. July 13th, 2019, 10:10 PM   #6
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 Originally Posted by DarnItJimImAnEngineer I assumed they meant 3rd-order. I can give you the engineering solution (attached).
Hello,

How did You calculate?Thank you very much!

All the best,

Integrator July 14th, 2019, 07:40 AM   #7
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 Originally Posted by Integrator Hello, [MATH]$\displaystyle \{-3.7\}=0.3$. All the best, Integrator
did you mean 0.7? July 14th, 2019, 08:01 AM   #8
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 Originally Posted by romsek did you mean 0.7?
Hello,

No!If $\displaystyle [-3.7]=-4$ , then $\displaystyle \{-3.7\}=0.3$.

Al the best,

Integrator July 14th, 2019, 09:03 AM   #9
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 Originally Posted by Integrator How did You calculate?
I didn't; I asked MATLAB to do it for me. Of course, that was before I knew what [x] and {x} meant in your equation. July 14th, 2019, 10:06 AM #10 Global Moderator   Joined: Dec 2006 Posts: 20,969 Thanks: 2219 What definitions apply if $x$ isn't real? If $x$ has to be real, $0 < x < 1$, in order that $[x]= 0$, but there are no values of $x$ in that range that satisfy the equation. Tags equation, grade Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post dschwart Elementary Math 6 April 15th, 2015 10:11 PM Inntekter er til Kredit Algebra 1 November 24th, 2014 02:39 AM stuart467 Elementary Math 0 March 4th, 2014 06:06 PM n3rdwannab3 Algebra 6 October 17th, 2010 07:52 PM Daemn Algebra 2 April 27th, 2009 04:30 AM

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