Question

Find the derivative of f(x) = - 9/x at x = -12.

Answer 1

f(x) = -9 / x = -9x^-1
f'(x) = -9(-1)x^-2 = 9 / x^2
f'(-12) = 9 / (-12)^2 = 9 / 144 = 1 / 16

Answer 2

My answer options are: 72/5, 5/72, 6/5,5/6..? @TURITW

Answer 3

@Ahmad1 @oldrin.bataku ??

Answer 4

Is the question correct?

Answer 5

yeah, I tried doing it the way you did too, and I've got nothing..@TURITW

Answer 6

@TURITW

Answer 7

\[-9x ^{-1} = 9x^{-2} \rightarrow 9*144^{-1} =\frac{ 9 }{ 144 }=\frac{ 1 }{ 16 }\]

Answer 8

^^^ doesn't work

Answer 9

Probably question or answer is wrong

Answer 10

well my teach wants me to find it by using the quotient property

Answer 11

f(x) = -9 / x
f'(x) = (x(0) - (-9)(1)) / x^2 = 9 / x^2

Answer 12

nothing changes dude the answer still the same

Answer 13

lol yeah so..i don't really know how to solve it because that's the only way i've used

Answer 14

I got your point, you still using diffrence qutiont to find the derivative , just few weeks and you will be learning these rules