Hi guys I am computing the derivative to check the intervals of increase/decrease of my given function. I was just wanting to know when I check the vertical asymptote in the denominator would I check in the original function f(x)'s denominator or f'(x) 's denominator after I differentiate. Then when I am check concavity should I check the denominator of f(x) f'(x) or f''(x). I am just looking for a bit of clarification.

Thanks

qbkr21