2014 TWO(b)

Achievement
Question
Find the gradient of the curve defined by y=8ln(3x2)y = 8\ln(3x - 2) at the point where x=2x = 2.

Show any derivatives that you need to find when solving this problem.
Official Answer
y=8ln(3x2)y=8\ln(3x-2)
dydx=24(3x2)\dfrac{dy}{dx}=\dfrac{24}{(3x-2)}

At x=2x=2 dydx=6\dfrac{dy}{dx}=6
Grading Criteria

Achievement (u)

  • A correct solution.

Merit (r)

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Excellence T1

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Excellence T2

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