Question 16 of 18 in Graphs 9

Graphs 9

2 marks · Hard

Differentiate the function with respect to , and state the value of the gradient when .

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-1 (±0)

Common mistakes: Sign error in differentiating -7x^2; Calculation or substitution error

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Marking points

M1 · 1 mark · Differentiates each term of the polynomial correctly.

A1 · 1 mark · Evaluates the gradient at x = -1 correctly as -1. (follow-through)

Worked solution

Differentiate each term:

Substitute :

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