Question

Evaluate f(x)=-x^-4 for x=3

Answer 1

Answer:

- $\frac{1}{81}$

Step-by-step explanation:

Using the rule of exponents

• $a^{-n}$ ⇔ $\frac{1}{a^{n} }$

Hence

f(3) =- $3^{-4}$ = - $\frac{1}{3^{4} }$ = - $\frac{1}{81}$

Answer 2

The answer would be -0.012345679.

The first thing you would do is substitute 3 in for x, seeing that you've told us x = 3. After you've substituted x, the equation would look something like:

f(3) = -3^-4. From here, all you have to do is solve! -3 to the power of -4 equals -0.012345679. Therefor, f(3) = -3^-4 equals -0.012345679