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zrq1229
zrq1229 zrq1229
  • 01-08-2016
  • Mathematics
Answered

Need help.

Find the derivative of f(x) = 5x + 9 at x = 2.

Find the derivative of f(x) = 6 divided by x at x = -2.


Thanks

Verified Answer :

konrad509
konrad509 konrad509
  • 01-08-2016

\(f(x)=5x+9\\ f'(x)=5\)
The derivative is constant. It's equal 5 for any argument.

\(f(x)=\dfrac{6}{x}\\ f'(x)=-\dfrac{6}{x^2}\\ f'(-2)=-\dfrac{6}{(-2)^2}=-\dfrac{6}{4}=-\dfrac{3}{2}\)

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