Engineering Board Exam Reviewer · Determinants · medium

If the determinant of a 3×3 matrix A is 8, find the determinant of 2A.

  1. 64
  2. 16
  3. 24
  4. 8

Answer

A. 64

Solution

For an n× n matrix, (kA)=kn (A). Here n=3: (2A)=23(8)=64.

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