# Math Help - Compute Limit x->infinity

1. ## Compute Limit x->infinity

lim x-> sqrt(x^2 +7)

I am stumped and my brain is not working.

I tried rationalizing it:

x^2 +7 / sqrt(x^2 +7)

then dividing the highest power in denominator

x+ (7/x) / sqrt(1 + 7/x^2)

Finally:

x/1

What kind of answer is this??

2. ## Re: Compute Limit x->infinity

Think about the square root function - it tends to infinity slowly...