Finding Big-O of sqrt(x^3+x^2+3) - Is Reverse the Same?

[shahin93]

Homework Statement

how do i find the least n such that

sqrt(x^3+x^2+3) is O(x^n)?

is the reverse the same?

 

[tiny-tim]

hi shahin93!

try it for x = 10, then x = 100, then x = 100000 …

you'll soon get the hang of what n needs to be ​