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Evaluate underset(x to -oo)lim(sqrt(x^(2...

Evaluate `underset(x to -oo)lim(sqrt(x^(2)+3x+1))/(2x+4)`

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`underset(x to -oo)lim (sqrt(x^(2)+3x+1))/(2x+4)`
`underset(x to -oo)lim(|x|sqrt(1+3/x + 1/x^(2)))/(x(2+4/x)) = - 1/2`
` underset(x to -oo)lim(-xsqrt(1+3/x+1/x^(2)))/(x(2+4/x))= -1/2`
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