Find the derivative of f(x) = negative 10 divided by x at x = -12.

asked Aug 23, 2019 72.7k views

2 votes

by Lijun

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$f(x)=(10)/(x);\ D:x\\eq0\\\\f'(x)=-(10)/(x^2)\\\\x=-12\to f'(-12)=(-10)/((-12)^2)=(-10)/(144)=-(5)/(72)$

Rich Schuler answered Aug 30, 2019

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