Concavity and Points of Inflection (HSC SSCE Mathematics Advanced): Quizzes

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Concavity and Points of Inflection
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If f′′(a)>0f''(a) > 0, what is the concavity of the curve at x=ax = a?

Concave up

Which shape best describes a curve that is concave up?

Cup that can hold water (∪\cup)

What TWO conditions are required for a point of inflection?

f′′(x)=0f''(x) = 0 AND f′′(x)f''(x) changes sign

Is f′′(x)=0f''(x) = 0 sufficient to guarantee a point of inflection?

No, concavity must also change sign

If f′(a)=0f'(a) = 0 and f′′(a)<0f''(a) < 0, what is at x=ax = a?

Maximum turning point

If f′(a)=0f'(a) = 0 and f′′(a)>0f''(a) > 0, what is at x=ax = a?

Minimum turning point

When is the second derivative test inconclusive for a stationary point?

When f′′(a)=0f''(a) = 0

How do you find the gradient of an inflectional tangent at x=ax = a?

Evaluate f′(a)f'(a)

Where can f′′(x)f''(x) change sign?

At zeroes or discontinuities of f′′(x)f''(x)

A point of inflection is where the tangent does what to the curve?

Crosses the curve

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