The Graph of the Derivative Function (VCE SSCE Mathematical Methods): Flashcards

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The Graph of the Derivative Function
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What does f(x)f'(x) tell us?

Gradient/slope of f(x)f(x) at every point

Derivative of quadratic function

Linear function (straight line)

Derivative of cubic function

Quadratic function (parabola)

How does degree change from f(x)f(x) to f(x)f'(x)?

Degree drops by one

When f(x)>0f'(x) > 0, what is f(x)f(x) doing?

Increasing (going upward)

When f(x)<0f'(x) < 0, what is f(x)f(x) doing?

Decreasing (going downward)

At turning points, what is f(x)f'(x)?

Zero (derivative crosses xx-axis)

Derivative of linear function

Constant (horizontal line)

Where is f(x)=xf(x) = |x| not differentiable?

At x=0x = 0 (sharp corner)

What causes non-differentiability?

Sharp corners, cusps, vertical tangents, discontinuities

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