Question

Find the derivative of f(x) =(-9/x) at x = -8.
i dont know how to solve it as a fraction?

Answer 1

f'(x)=9/(x^2)
f'(-8)=9/((-8)^2)=9/64

Answer 2

it's the same as (-9) * (1/x)

Answer 3

thanks!(:

Answer 4

you are welcome.

Answer 5

ask me more questions on differentiation.