the question asks:
Find $f '(a)$, $f(x) = \frac{x^2 + 1}{x - 5}$
$f'(a)=$ [answer box here]
I understand that $f'(a)$ is the derivative, but i don't understand what the derivative is. Or how to solve this. I am used to finding a tangent slope with two points. This one doesn't have that. So i don't understand how i can use the definition to solve this. Thanks,