Question

Find the derivative of f(x) = -9/x at x = 6.

Answer 1

is it 3/2

Answer 2

Nah. Ill let mebs finish, though :P

Answer 3

Write the equation as so .\[Y = -9(x)^{-1}\]

than Use the first principle rule. \[\frac{dy}{dx} = -9 (-1)(x)^{-1 -1}\]

Answer 4

so its 9x^-1-1

Answer 5

Than your equation looks like this \[\frac{dy}{dx} = \frac{ 9 }{ x^{2} }\]
than evaluate at x = 6.

Answer 6

so its 1/4

Answer 7

yes

Answer 8

i have three more for anyone else willing to help ill post them in a new question

Answer 9

good idea.. let psymon try.