Sketching Gradient Functions (AQA A-Level Mathematics): Quizzes

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Sketching Gradient Functions
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What does the gradient function f′(x)f'(x) represent at each point xx?

Slope of f(x)f(x) at that point

Where does the graph of f′(x)f'(x) lie when f(x)f(x) is increasing?

Above the xx-axis

What is the sign of f′(x)f'(x) when f(x)f(x) is decreasing?

f′(x)<0f'(x) < 0

What is the value of f′(x)f'(x) at a stationary point of f(x)f(x)?

f′(x)=0f'(x) = 0

At a local maximum of f(x)f(x), how does f′(x)f'(x) cross the xx-axis?

From positive to negative

At a local minimum of f(x)f(x), how does f′(x)f'(x) cross the xx-axis?

From negative to positive

When f(x)f(x) is concave up, what is happening to f′(x)f'(x)?

f′(x)f'(x) is increasing

When f(x)f(x) is concave down, what is happening to f′(x)f'(x)?

f′(x)f'(x) is decreasing

At an inflection point of f(x)f(x), what typically happens to f′(x)f'(x)?

Reaches a minimum or maximum

How should the gradient function be sketched in terms of smoothness?

As a smooth curve without sharp corners

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