Digital ACT Math Practice Question #1991
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
det = ad - bc = 0. Solve directly: k = 9.
The determinant of a 2x2 matrix [[a, b], [c, d]] is ad - bc. Setting the determinant equal to 0 yields k = 9....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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