Thread: Substituting f(x)

I know this is really basic why does



equal



and not

Originally Posted by Envy

I know this is really basic why does



equal



and not

Your question does not make any sense.


Are you asking:

If what does equal?


Let .


You would have



.

Substituting 2 into the equation



-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