Question

Find the derivative of f(x) = - 8 / x at x = 11.

Answer 1

\[f(x)=-\frac{ 8 }{x }=-8 x ^{-1}\]
\[f \prime(x)=-8(-1)x ^{-2}=\frac{ 8 }{ x^2 }\]
\[f \prime(11)=?\]

Answer 2

is f 8/x^2??

Answer 3

\[f \prime(11)=\frac{ 8 }{ \left( 11 \right)^2 }=\frac{ 8 }{ 121 }\]

Answer 4

okay that makes sense!! thanks so much:D

Answer 5

yw