Think about the square root function - it tends to infinity slowly...
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)
What kind of answer is this??