Determinants
Oswaal
CBSE
Grade 12
Question:
If $A = \begin{bmatrix} 1 & 1 & 1 \\ 1 & 2 & 3 \\ 1 & 4 & 9 \end{bmatrix}$, find $A^{-1}$ and solve system $x + y + z = 6, x + 2y + 3z = 14, x + 4y + 9z = 36$.
Step-by-Step Solution
Key Concept: |A| = 2. Solution x = 1, y = 2, z = 3.
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Correct Answer:
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