# When the second derivative is positive is it concave up or down?

## When the second derivative is positive is it concave up or down?

Our work is confirmed by the graph of f in Figure 3.4. 8. Notice how f is concave up whenever f″ is positive, and concave down when f″ is negative.

**What is the relationship between the second derivative and concavity?**

The second derivative describes the concavity of the original function. Concavity describes the direction of the curve, how it bends… Just like direction, concavity of a curve can change, too. The points of change are called inflection points.

### What does it mean if second derivative is positive?

If the second derivative is positive, then the first. derivative is increasing, so that the slope of the tangent line to the function is increasing as x increases. We. see this phenomenon graphically as the curve of the graph being concave up, that is, shaped like a parabola. open upward.

**What does concave up mean second derivative?**

Graphically, a function is concave up if its graph is curved with the opening upward (Figure 1a). Similarly, a function is concave down if its graph opens downward (Figure 1b). Figure 1. The derivative of a function f is a function that gives information about the slope of f.

## Is concave up positive or negative?

In order to find what concavity it is changing from and to, you plug in numbers on either side of the inflection point. if the result is negative, the graph is concave down and if it is positive the graph is concave up.

**What does it mean when derivative is positive?**

increasing

For what values of x is the sign of the derivative positive? Answer: When the sign of the derivative is positive, the graph is increasing. The sign of the derivative is positive for all values of x > 0.

### What does it mean when the first derivative is positive and the second derivative is negative?

As stated above, if the second derivative is positive, it implies that the derivative, or slope is increasing, while if it is negative, implies that the slope is decreasing. As a graphical example, consider the graph, y=(x)(x−2)(x−3) which looks like this.

**Is the second derivative positive or negative?**

On the graph of a function, the second derivative corresponds to the curvature or concavity of the graph. The graph of a function with a positive second derivative is upwardly concave, while the graph of a function with a negative second derivative curves in the opposite way.

## How do you know if concave up or down?

If f “(x) > 0, the graph is concave upward at that value of x. If f “(x) = 0, the graph may have a point of inflection at that value of x. To check, consider the value of f “(x) at values of x to either side of the point of interest. If f “(x) < 0, the graph is concave downward at that value of x.

**How do you find second derivative with concave up and down?**

We can calculate the second derivative to determine the concavity of the function’s curve at any point.

- Calculate the second derivative.
- Substitute the value of x.
- If f “(x) > 0, the graph is concave upward at that value of x.
- If f “(x) = 0, the graph may have a point of inflection at that value of x.