I know this is really basic why does

equal

and not

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- Jun 3rd 2009, 05:33 AMEnvySubstituting f(x)
I know this is really basic why does

equal

and not

- Jun 3rd 2009, 05:35 AMProve It
- Jun 3rd 2009, 05:38 AMJoel
Substituting 2 into the equation

http://www.mathhelpforum.com/math-he...d5227ede-1.gif

-4 * ( 2 to the power of -1 )

2 to the power of -1 is the same as 1 / 2

so -4 * 1/2 = -2 and not -8