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??

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- July 12th 2011, 08:12 PMNeoSonataCompute 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?? - July 12th 2011, 08:19 PMProve ItRe: Compute Limit x->infinity
Think about the square root function - it tends to infinity slowly...