What is the complete set of numbers for which f(x) = x3 + 2x2 - x is concave?

Concave up at

Concave down at

Step-by-step explanation:

The given function is

In order to check the concavity, we find the inflection point. To find inflection point we calculate the second derivative of the function and then equate it to zero.

The first derivative is given by

The second derivative is given by

For inflection point

Hence, the inflection point is

Hence, on the left of   the curve is concave downward and on the right of   the curve is concave up.

Hence,

Concave up at

Concave down at

2.

according to newton’s cannonball model, what happens if the cannonball's velocity is enough to overpower the pull of earth’s gravitystep-by-step explanation:

i think asking google will you get the answer to that question