When will the following converge/diverge?

for what values of p, q will the following integral converge??

intergal from (0 - ∞ ) of

[tex]\int[/tex]dx/(x^p +x^q)

i know that both [tex]\int[/tex]dx/(x^p) and [tex]\int[/tex]dx/(x^q) will converge when p,q>1 and i know that is smaller than either [tex]\int[/tex]dx/(x^p) or [tex]\int[/tex]dx/(x^q) alone since x>0, the denominator will be bigger so the fraction will be smaller.

so p,q>1 converge

but i dont think this is a proper answer, since as far as i see it is a possibility but not necessarily the only one,

how do i reach the correct answer?

 

since i looked at dx/(x^p) and dx/(x^q) seperately i meant that they both were bigger than 1, but now looking at what i wrote and your answer, i am not sure that that wat the right thing to do, let me try explain.
what i was looking at was the comarison where

{g(x) > f(x)} and g(x) converges, then f(x) converges
{g(x) > f(x)} and g(x) diverges, then f(x) diverges

how would you go about solving this.
i have another question based on the same principal, but a more complex function and would like to know this one before attempting it.