We often use integrals of the functions 
, for various values of p, to help determine whether other integrals converge or diverge.
You already did the work to show this, so we'll just summarize the results. Assuming p is greater than 0 (because otherwise the exponents do weird things),
converges if p < 1 and diverges otherwise.
converges if p > 1 and diverges otherwise.
This is often called the p-test for improper integrals.
where p > 1 and the interval of integration is [0,1], this integral diverges.
gets close to the x-axis quickly as x approaches ∞. If you can remember this, then you can remember that
with p > 1 and we're integrating from 0 to 1.
with p < 1, so this integral converges.
with p > 1 and we're integrating from 1 to ∞.
is of the form