CBSE Class 12 Mathematics 2026 Supplementary Paper 65(B)/7 · Q11 Marksdeterminant_expansion
CBSE Class 12 Mathematics 2026 Supplementary Paper 65(B)/7 · Question 1 (Determinants)
If det([[3,x,−4],[5,−6,0],[−7,8,1]])=0, find x.
✅ Step-by-Step Solution
Final Answer: −2
- Expansion along row 2 gives −18−5x+8=−10−5x, which vanishes at x=−2.
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