Substituting f(x)

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June 3rd 2009, 05:33 AM
Envy

Substituting f(x)

I know this is really basic why does

$<br /> f(2)=-4{x}^{-1}$

equal

$<br /> -2$

and not

$-8$
June 3rd 2009, 05:35 AM
Prove It

Quote:

Originally Posted by Envy

I know this is really basic why does

$<br /> f(2)=-4{x}^{-1}$

equal

$<br /> -2$

and not

$-8$

Your question does not make any sense.

Are you asking:

If $f(x) = -4x^{-1}$ what does $f(2)$ equal?

Let $x = 2$ .

You would have $f(2) = -4(2)^{-1}$

$= -4\left(\frac{1}{2}\right)$

$= -2$ .
June 3rd 2009, 05:38 AM
Joel

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

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