Understanding Derivatives and Concavity

The video tutorial explains how to determine the intervals where the first and second derivatives of a function are positive or negative. It begins with an analysis of the first derivative, discussing how it indicates whether a function is increasing or decreasing. The tutorial then covers the second derivative, explaining its role in determining the concavity of a function and identifying points of inflection. Key concepts such as tangent line slopes and interval notation are also discussed.

What does it mean for a function if its first derivative is positive?

• The function is decreasing.

• The function is constant.

• The function is concave down.

• The function is increasing.

If the first derivative of a function is negative, what can be inferred about the function?

• The function is constant.

• The function is concave up.

• The function is decreasing.

• The function is increasing.

On which interval is the first derivative positive according to the video?

• From negative infinity to -2

• From +2 to infinity

• From -2 to +2

• From -2 to infinity

What is the behavior of the function on the interval from -2 to +2?

• The function is concave up.

• The function is increasing.

• The function is constant.

• The function is decreasing.

What happens to the slope of the tangent line at x = -2 and x = +2?

• The slope is positive.

• The slope is negative.

• The slope is zero.

• The slope is undefined.

What does a positive second derivative indicate about a function's concavity?

• The function is concave down.

• The function is constant.

• The function is concave up.

• The function is linear.

If the second derivative is negative, what is the concavity of the function?

• Constant

• Linear

• Concave down

• Concave up

At what point does the function change concavity?

• x = -2

• x = 0

• x = infinity

• x = +2

What is the term for the point where a function changes concavity?

• Critical point

• Vertex

• Asymptote

• Point of inflection

On which interval is the function concave up?

• From +2 to infinity

• From negative infinity to zero

• From -2 to +2

• From zero to positive infinity