I'm not good at fractions and radicals and I have two questions that I can't answer. Here is the questions

a. sqrt[ (3x+1) / (2x-1)]

b. 2 / [ (6x^2+5x+1) ]^2

How can I solve this using this formula f(x) = [ f(x+h) - f(x) ] / h . I will really appreciate if you can give me the full solution + explanation (process). Thanks.