Question

I'm trying to find the derivative of -6/x at x = 12

Answer 1

\(\dfrac{d}{dx}cf(x)=c*f'(x)\)
separate it as \(-6*\dfrac{1}{x}\)

Answer 2

\[\frac{ \frac{ -6 }{ x-h } - \frac{ -6 }{ x } }{ h }\]

Answer 3

I've never seen what you said before @bibby

Answer 4

you just derive 1/x, then multiply whatever you get by -6. substitute x for 12 and solve.