Number 6
1 mark · NormalSimplify .
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81
Also accept: 81
Common mistakes: forgetting to convert 9 to base 3
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Marking points
A1 · 1 mark · Correctly simplifies to 81.
Worked solution
3^{-2} × 9^2 = 3^{-2} × (3^2)^2 = 3^{-2} × 3^4 = 3^{2} = 9.