Showing The Expression Behavior as x approach infinity I have an expression
$x^2[log(1+\sqrt x+x)+C], x\in \mathbb{R},>0$
Where C is an arbitrary constant
I want to find whether this expression is asymptotic to $x$ when $x\rightarrow\infty$
So far I tried log inequality properties and taking advantage of choosing C and so on...
But no luck. 
Any suggestions or help will be appreciated!
Thank you so much for reading and having interest in my question.

No, it is not asymptotic to $x$
$$\lim_{x \to \infty} \frac{x^2(\log(1 + \sqrt{x} + x) + C)}{x} = \infty$$
