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Question 15 (MCQ) - Verifying properties of a determinant - Chapter 4 Class 12 Determinants
Last updated at August 21, 2026 by Teachoo
Verifying properties of a determinant
Chapter 4 Class 12 Determinants
Concept wise
- Finding determinant of a 2x2 matrix
- Evalute determinant of a 3x3 matrix
- Area of triangle
- Equation of line using determinant
- Finding Minors and cofactors
- Evaluating determinant using minor and co-factor
- Find adjoint of a matrix
- Finding Inverse of a matrix
- Inverse of two matrices and verifying properties
- Finding inverse when Equation of matrice given
- Checking consistency of equations
- Find solution of equations- Equations given
- Find solution of equations- Statement given
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Verifying properties of a determinant
- Two rows or columns same
- Whole row/column zero
- Whole row/column one
- Making whole row/column one and simplifying
- Proving Determinant 1 = Determinant 2
- Solving by simplifying det.
- Using Property 5 (Determinant as sum of two or more determinants)
Transcript
Question 15 Choose the correct answer. Let A be a square matrix of order 3 ร 3, then |"kA" | is equal to A. "k" |"A" | B. "k" 2|"A" | C. "k" 3|"A" | D. 3"k" |"A" | Let A = [โ 8(๐1&๐1&๐1@๐2&๐2&๐2@๐3&๐3&๐3)]_(3 ร 3) We need to find |kA| kA = k [โ 8(๐1&๐1&๐1@๐2&๐2&๐2@๐3&๐3&๐3)] = [โ 8(๐๐1&๐๐1&๐๐1@๐๐2&๐๐2&๐๐2@๐๐3&๐๐3&๐๐3)] If a matrix is multiplied by a constant, then constant is multiplied to all elements of matrix |"kA" | = |โ 8(๐๐1&๐๐1&๐๐1@๐๐2&๐๐2&๐๐2@๐๐3&๐๐3&๐๐3)| Taking out k common from R1 R2 & R3 = k. k. k |โ 8(a1&b1&c1@a2&b2&c2@a3&b3&c3)| = k3 |โ 8(a1&b1&c1@a2&b2&c2@a3&b3&c3)| = k3 |A| Thus, Correct answer is C Property: If each element of row of determinant is multiplied by a constant k , then its value get multiplied by k
