2019 ONE(a)

Achievement
Question
Differentiate y=3x21y = \sqrt{3x^2 - 1}.

*You do not need to simplify your answer.*
Official Answer
dydx=12(3x21)126x\dfrac{dy}{dx}=\dfrac{1}{2}(3x^2-1)^{-\frac{1}{2}}\cdot 6x
=3x3x21=\dfrac{3x}{\sqrt{3x^2-1}}
Grading Criteria

Achievement (u)

  • Correct derivative.
  • Anything equivalent.

Merit (r)

-

Excellence T1

-

Excellence T2

-
Video Explanation
NCEA Level 3 Calculus Differentiation 2019 NZQA Exam - Worked Answers by infinityplusone(starts at 0:32)
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