Question

f"(x)=-(2(x^2-3)/(x^2+3)^2)
Use interval notation to indicate where f(x) is concave up and where f(x) is concave down.

Answer 1

you have to study the sign of this function.

Answer 2

so i have to make a chart to see which signs are positive or negative

Answer 3

yeap
if it's positive that's mean your function f is bending up, if negative bending down