# Answer to Question #1852 in Calculus for Abhilash

Question #1852
Consider the function below. (If you need to use -infinity or infinity, enter -INFINITY or INFINITY.) f(x) = sqrt(x^2+3) - x (a) Find the horizontal asymptote. y = _____________ (b) Find the interval where the function is decreasing. ( _________, ____________) (c) Find the interval where the function is concave up. ( _________, __________)
(a)
lim(x-&gt;&infin;) (&radic;(x2+3) - x) = lim(x-&gt;&infin;) (x &radic;(1+3/x2) - x) = lim(x-&gt;&infin;) (x - x) = 0.
The horizontal asymptote is y = 0
(b)
The derivation of the function
Thus the function is decreasing on the interval (-&infin; , + &infin;)
(c) The second derivation of the function
(x/&radic;(x2+3) - 1)&#039; = ((x2+3)-1/2-1/2* 2x*x* (x2+3)-3/2) = (x2 +3-x2)/(x2+3)3/2 =3/(x2+3)3/2 is always positive, thus the function concaves up on the interval (-&infin; , + &infin;)

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