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Ex 4.2
Ex 4.2, 2 Important Deleted for CBSE Board 2022 Exams
Ex 4.2, 3 Deleted for CBSE Board 2022 Exams
Ex 4.2, 4 Deleted for CBSE Board 2022 Exams You are here
Ex 4.2, 5 Important Deleted for CBSE Board 2022 Exams
Ex 4.2, 6 Important Deleted for CBSE Board 2022 Exams
Ex 4.2, 7 Important Deleted for CBSE Board 2022 Exams
Ex 4.2, 8 (i) Important Deleted for CBSE Board 2022 Exams
Ex 4.2, 8 (ii) Deleted for CBSE Board 2022 Exams
Ex 4.2, 9 Important Deleted for CBSE Board 2022 Exams
Ex 4.2, 10 (i) Deleted for CBSE Board 2022 Exams
Ex 4.2, 10 (ii) Important Deleted for CBSE Board 2022 Exams
Ex 4.2, 11 (i) Deleted for CBSE Board 2022 Exams
Ex 4.2, 11 (ii) Important Deleted for CBSE Board 2022 Exams
Ex 4.2, 12 Important Deleted for CBSE Board 2022 Exams
Ex 4.2, 13 Important Deleted for CBSE Board 2022 Exams
Ex 4.2, 14 Important Deleted for CBSE Board 2022 Exams
Ex 4.2, 15 (MCQ) Important Deleted for CBSE Board 2022 Exams
Ex 4.2, 16 (MCQ) Deleted for CBSE Board 2022 Exams
Last updated at Jan. 22, 2020 by Teachoo
Ex 4.2, 4 Using the property of determinants and without expanding, prove that: |■8(1&𝑏𝑐&𝑎(𝑏+𝑐)@1&𝑐𝑎&𝑏(𝑐+𝑎)@1&𝑎𝑏&𝑐(𝑎+𝑏))| = 0 |■8(1&𝑏𝑐&𝑎(𝑏+𝑐)@1&𝑐𝑎&𝑏(𝑐+𝑎)@1&𝑎𝑏&𝑐(𝑎+𝑏))| = |■8(1&𝑏𝑐&𝑎𝑏+𝑎𝑐@1&𝑐𝑎&𝑏𝑐+𝑏𝑎@1&𝑎𝑏&𝑐𝑎+𝑐𝑏)| C3 → C3 + C2 = |■8(1&𝑏𝑐&𝑎𝑏+𝑎𝑐+𝑏𝑐@1&𝑐𝑎&𝑏𝑐+𝑏𝑎+𝑏𝑐@1&𝑎𝑏&𝑐𝑎+𝑐𝑏+𝑏𝑐)| Taking (𝑎𝑏+𝑎𝑐+𝑏𝑐) common from C3 = (𝑎𝑏+𝑎𝑐+𝑏𝑐) |■8(𝟏&𝑏𝑐&𝟏@𝟏&𝑐𝑎&𝟏@𝟏&𝑎𝑏&𝟏)| C1 and C3 is same = 0 By Property: if any two row or columns of a determinant are identical then value of determinant is zero