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I am looking for a calculator which can calculate functions like $f(x) = x+2$ at $x=a$ etc; but I am unable to do so. Can you recommend any online calculator?

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  • $\begingroup$ Check mark the first entry in Function calculator then hit the show button. $\endgroup$ – J. W. Perry Jun 23 '14 at 14:19
  • $\begingroup$ Or use a spreadsheet (Microsoft or Open Office). $\endgroup$ – lemon Jun 23 '14 at 14:20
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    $\begingroup$ wolframalpha.com... you can enter the expression "f(x) = x+2 at x=a" exactly as you wrote it in your question... Personally, I would rate this site as one of the most innovative websites ever created (alongside Wikipedia, Stack Overflow (or Stack Exchange in general), YouTube and Google Maps). $\endgroup$ – barak manos Jun 23 '14 at 14:30
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Try the Desmos Graphing Calculator. The output looks really nice.

See an interactive example of drawing lines.

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GeoGebra works well for this, eg http://web.geogebra.org/?command=f(x)=x+2;a=2;f(a)

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You can use the Calcpad online calculator for free: Just go to http://calcpad.net/Calculator Try to type the following example into the 'Script' box:

f(x) = x + 2
a = 4
f(a)
a = 6
f(a)
$Plot{f(x) @ x = 0 : a}

Then press 'Enter' or refresh the output to see the results

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