Question

f(x) = 8 + 2x - x^2

Answer 1

intervals where f(x) is concave up and intervals where f(x) is concave down?

Answer 2

f''(x) = -2

Answer 3

If f '' (x)>0, then the function is concave up.

If f ''(x)<0, then the function is concave down.

so its concave down from (-infinity, infinity)

Answer 4

ohhh oook!!!! thanks!