Question

What is the value of f(x) = 9x when x = -2?

Answer 1

A. 1/81
B. 81
C. 1/18
D. 18

Answer 2

Is x an exponent?

Answer 3

just plug in x it should look like 9-2

Answer 4

9-2 is not there

9 * -2 is not there

Answer 5

no you have to solve it to

Answer 6

9x = -2 ?

Answer 7

no you take 9 then subract two from it

Answer 8

subtract*

Answer 9

We are having a good time, but where is lujanels1 who has the original problem?

Answer 10

I have no idea

Answer 11

How good are you with rational expressions?

Answer 12

I have taught them. Got a question?

Answer 13

How do you solve an equation like this:

\[\frac{ a ^{3}+3a-28 }{a ^{2}-49}\]

Answer 14

Equation? What does it equal?

Factor top and bottom. Cancel like factors. Just like a regular fraction.

Answer 15

thanks guys ! but I don't think the answer I got was correct

Answer 16

If x is an exponent 9 ^ (-2) the answer is there.

Answer 17

the answer is not 18, and that is what i got so i didn't solve it right.

Answer 18

Are you told 18 is right?

Answer 19

it doesn't say. it just doesn't look right.

Answer 20

\[f(x) = 9^{x} \]

Is that the problem?

Answer 21

yes

Answer 22

So find out what 9 ^ (-2) is. What do ya get?

Answer 23

Any progress on your problem Sillybutt100?

Answer 24

okay I got 1/81

Answer 25

Oh yeah!

Answer 26

thanks!