JEE Main 2012 Mathematics question
Statement 1: If the system of equations x + ky + 3z = 0, 3x + ky − 2z = 0, 2x + 3y − 4z = 0 has a nontrivial solution, then the value of k is . Statement 2: A system of three homogeneous equations in three variables has a non trivial solution if the determinant of the coefficient matrix is zero.
Answer: (1)
Solution
$ = (-4k + 6) - k(-12 + 4) + 3(9 - 2k) = 33 - 2k = 0
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