evaluate -f(x) for f(x) = 3x - 2x - 4

[georgebaseball]

Please explain how to evaluate this function at the indicated value:

For: f(x) = 3x - 2x - 4

Find: -f(x)

 

[Denis]

Re: HOW TO SOLVE

please how to evaluate this funtion at the indicated value
f(x) =3x-2x-4
find : -f(x)

First georgie baby, simplify 3x-2x-4 : what do you get?

 

[stapel]

Find: -f(x)

According to what you've posted, you're not "evaluating" (replacing "x" with a value and simplifying) at all; you're just changing all the signs on (taking the negative of) f(x).

Eliz.

 

[georgebaseball]

Thanks Denis and stapel

so the correct answer would be

f(x) = 3x - 2x - 4

f(-x) = -3x+2x+4

is that right?

 

[stapel]

so the correct answer would be f(-x) = -3x+2x+4

Now you've posted a different exercise. Are you supposed to be finding f(-x), or -f(x)?

And, as Denis pointed out, is the function formula really written as "3x - 2x - 4"? Since 3 - 2 = 1, there is no reason to write the formula this way, rather than just "x - 4".

Please reply with the full and exact text of the exercise and the complete instructions. Thank you.

Eliz.

 

[georgebaseball]

sorry, the excercise is

Given f(x) = 3x-2x-4 evaluate -f(x)

note: I don't know how to type the square symbol , but is supposed to be 3x to the square -2x-4

 

[stapel]

sorry, the excercise is
Given f(x) = 3x-2x-4 evaluate -f(x)".

viously, "-f(x)" does not involve any "evaluation"; you're just changing the signs on all of the terms.

I don't know how to type the square symbol , but is supposed to be 3x to the square -2x-4

Do you mean "how to type the 'power' symbol"? Because "-2x - 4" is not "squared".

To learn simple formatting, please follow the link (in the "Forum Help" pull-down menu at the very top of the page) to "Karl's Notes". It will explain how to use "^" to indicate powers.

Note: For f(x) = 3x^{-2x - 4}, the process for finding -f(x) is as explained earlier. There is only one term, though, so only one sign should be changed.

Eliz.