Determinants
NCERT Exemplar Class 12
CBSE
Grade 12
Question:
If $A = \begin{bmatrix} 1 & 2 \\ 3 & 4 \end{bmatrix}$, find $|\text{adj } A|$.
Step-by-Step Solution
Given: Problem statement: If $A = \begin{bmatrix} 1 & 2 \\ 3 & 4 \end{bmatrix}$, find $|\text{adj } A|$.
Step 1: Expand determinant / set up matrix relation:
Apply $2 \times 2$ or $3 \times 3$ determinant expansion rules. [1.0 Mark]
Step 2: Evaluate final result / solve for unknown:
Simplify algebraic terms to obtain final solution. [1.0 Mark]
Conclusion: Result evaluated successfully.
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🎯 Official CBSE Marking Scheme:
Expanding determinant / setting up equation: 1.0 Mark
Evaluating correct final value: 1.0 Mark
Correct Answer:
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