Question

Please help me get the right answer?!

Answer 1

Hi!

Let's put the value of x into the equation.

f(-2) = $9^{-2}$
solve
f(-2) = 0.012345679

Now let's see if this is equal to any of the answers.

1/81 = 0.012345679 correct
81 = 0.012345679 wrong
1/18 = 0.012345679 wrong
18 = 0.012345679 wrong

The answer is A. 1/81 

Hope this helps! :)

Answer 2

The answer is A, $\frac{1}{81}$. This is because when plugging in -2 for x, the expression will look like this: $9^{-2}$. To make the exponent positive, you have to flip it into a fraction. Then it will be $\frac{1}{9^2}$. Lastly, you simplify the denominator into 81.