Question

Find the derivative of f(x) = 8 divided by x at x = -1

4

0

8

-8

Answer 1

Is f(x) = 8/x ?

Answer 2

Yeah

Answer 3

\[f(x) = 8x ^{-1}\]
\[f'(x) = (-1)\times8\times x^{-2} \]
At x = -1,
substitute x = -1 in f'(x)

Answer 4

I got -8 as an answer. But I'm not sure where you got the formula from.