Question 5 - Examples - Chapter 4 Class 12 Determinants

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Example 10 - Show |a b c a+2x b+2y c+2z x y z| = 0 - Examples

Example 10 - Chapter 4 Class 12 Determinants - Part 2
Example 10 - Chapter 4 Class 12 Determinants - Part 3

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Question 5 Show that |ā– 8(a&b&c@a+2x&b+2y&c+2z@x&y&z)| = 0 Solving L.H.S |ā– 8(a&b&c@a+2x&b+2y&c+2z@x&y&z)| Expressing elements of 2nd row as sum of two elements = |ā– 8(šš&š›&šœ@šš&š›&šœ@x&y&z)| + |ā– 8(a&b&c@2x&2y&2z@x&y&z)| By Property 5: If some or all elements of a row or column of a determinant are expressed as sum of two (or more) terms ,then the determinant is expressed as a sum of two (or more) determinants. R1 & R2 are identical Using property: If any two rows or columns are identical, then value of determinant is 0 = 0 + |ā– 8(a&b&c@2x&2y&2z@x&y&z)| = |ā– 8(a&b&c@šŸx&šŸy&šŸz@x&y&z)| Since, all elements of 2nd row are multiplied by 2, we can take 2 outside the determinant, = 2|ā– 8(a&b&c@x&y&z@x&y&z)| R2 & R3 are identical = 2 Ɨ 0 Using property: if any two rows or columns are identical, then value of determinant is 0 = 0 = R.H.S Thus L.H.S = R.H.S Hence proved

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