Question

Find the derivative of f(x) = 7/x at x = 1

Answer 1

Well, first, what's the derivative of the function?

Answer 2

ln?

Answer 3

That would be the integral of the function. Remember that: \(f(x)=\frac{7}{x}\).

Answer 4

i don't think i know it

Answer 5

it is much easier to do this as \(f(x) = 7(x^{-1})\)
so \(f^\prime(x) = 7(-1)(x^{-2})\)
\(f^\prime(1) = 7(-1)(1^{-2}) = -7\)

Answer 6

@LarsEighner thanks again