Question

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

Answer 1

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


`f(x)=(6)/(x)\\ f'(x)=-(6)/(x^2)\\ f'(-2)=-(6)/((-2)^2)=-(6)/(4)=-(3)/(2)`