Question

In order for a matrix to be inverse, what must be true?

Answer 1

D


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Answer 2

In order for the matrix to be inverse, its determinant must not equal to zero.

The inverse of a 2 × 2 matrix is: 1/(ad - bc)

In which (ad - bc) is the determinant. The determinant cannot be zero because division by zero is an undefined operation.

Therefore, the correct answer is:
D) ad - bc ≠ 0

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