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How is a determinant affected by adding a multiple of one row to another?

  • A.it is unchanged
  • B.it changes sign
  • C.it is multiplied by that same multiple
  • D.it becomes zero

Answer: A

This invariance is precisely what makes Gaussian elimination usable for evaluating determinants, since the value survives every such step. Only interchanges, which flip the sign, and scaling a row, which scales the value, alter it.

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