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CBSE Class 12 Math 2019 Delhi Set 1 Solved Paper

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Question : 15 of 29
Marks: +1, -0
Using properties of determinants, prove that ∣a2+2a2a+112a+1a+21331∣=(a−1)3\begin{vmatrix} a^2+2a & 2a+1 & 1 \\ 2a+1 & a+2 & 1 \\ 3 & 3 & 1 \end{vmatrix} = (a-1)^3.
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