zrq1229 zrq1229

01-08-2016
Mathematics

contestada

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

Respuesta :

konrad509 konrad509

01-08-2016

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

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

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