I tried to expand this expression (x-2)(x-3). I only want to recieive this result
(x-2)(x-3) = x^2 - 2x - 3x + 6, not this result 6 - 5 x + x^2 when I use Expand.
Expand[(x - 2) (x - 3)]
6 - 5 x + x^2
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1 Answer
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If you just want this for formatting output, you can use Latex
myExpand[(x-2) (x-3)]
myExpand[(x^2-2x+9) (x^2-3)]
Because this uses Latex strings to build the result, it does not ofcourse simplify same power terms of $x$ as Expand does.
<<MaTeX`
myExpand[p_Times]:=Module[{s,z,n,m,p1,p2},
p1=First@p; p2=Last@p;
s="";
Do[
z=p1[[n]]*p2[[m]];
s=s<>If[Internal`SyntacticNegativeQ[z],
ToString[TeXForm@z]
,
If[s=="",ToString[TeXForm@z],"+"<>ToString[TeXForm@z]]
]
,{n,1,Length@p1},{m,1,Length@p2}
];
MaTeX[s,Magnification->2]
]
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$\begingroup$ How can I use your code? I copy your code and compile, I cannot get the result. $\endgroup$ Commented Jul 10, 2023 at 6:11
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$\begingroup$ @JohnPaulPeter do you have
MaTeXpackage installed? You need that ofcourse to work. The first command is<<MaTeXwhich loads the package. This is well known package and very useful to have. Here is screen shot from my computer. !Mathematica graphics $\endgroup$– NasserCommented Jul 10, 2023 at 6:14 -
$\begingroup$ I document LaTeX, I write \usepackage{Matex}. Is this true? $\endgroup$ Commented Jul 10, 2023 at 6:17
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$\begingroup$ @JohnPaulPeter No. You do not need to do anything like this. Simply install the MaTeX package inside Mathematica. It will do everything for you and will compile the string to Latex inside Mathematica. The string
syou see in the function is Latex, but you need MaTeX to compile it. Just go to MaTeXInstall and run the command shown there. That is all. $\endgroup$– NasserCommented Jul 10, 2023 at 6:23 -
$\begingroup$ If you do not need to use this inside the notebook, simply copy the string
sand use it in your Latex document as is. Change the function above to returnsinstead of calling MaTeX as I showed. $\endgroup$– NasserCommented Jul 10, 2023 at 6:24
Distribute[(x - 2) . (x - 3)]$\endgroup$