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Concave Down

Definition

Concave down refers to the shape of a graph where it curves downward, resembling a frowning face. It indicates that the second derivative of a function is negative.

Related terms

Inflection Point: An inflection point is a point on the graph where the concavity changes from concave up to concave down or vice versa.

Decreasing Function: A decreasing function is one in which the y-values decrease as x-values increase.

Second Derivative Test: The second derivative test is used to determine whether a critical point on a graph corresponds to a local maximum or minimum by examining the sign of the second derivative.

"Concave Down" appears in:

Subjects (1)

  • AP Pre-Calculus

Study guides (4)

  • AP Calculus AB/BC - 4.6 Approximating Values of a Function Using Local Linearity and Linearization

  • AP Calculus AB/BC - 5.3 Determining Intervals on Which a Function is Increasing or Decreasing

  • AP Calculus AB/BC - 5.6 Determining Concavity

  • AP Calculus AB/BC - 5.9 Connecting a Function, Its First Derivative, and its Second Derivative

Practice Questions (5)

  • How does the tangent line approximation change when the function is concave down?

  • Which of the following pairs of parametric equations are concave down at t = 1?

  • A particle is moving on the xy-plane starting at t = 0. Its motion can be described by the parametric functions y(t) = 3t^3 - 2t and x(t) = ln(t). At what time, t, is the path of the particle neither concave up nor concave down?

  • A particle moves on the xy-plane. Its motion can be described by the parametric functions y(t) = sin(t) and x(t) = cos(t). For which t in the interval 0 ≤ t < 2π is the path of the particle concave down?

  • A video game character's attack and defense increase over time (t > 0) is given by the parametric equations A(t) = 3t^2+5t and D(t) = 2t^2+8t. James the gamer plots these values on a plot with attack as the x-axis and defense as the y-axis. Is the resulting curve concave up or concave down?

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About Us

About Fiveable

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CCPA Privacy Policy

Resources

Cram Mode

AP Score Calculators

Study Guides

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Glossary

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Crisis Text Line

Help Center

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AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.