ACT Math Practice Question #1401 (Medium (30)) | Test Citadel
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ACT Math Difficulty: Medium (30)

Digital ACT Math Practice Question #1401

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For what value of k does the matrix [[3, k], [4, 12]] have a determinant equal to 0?
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det = ad - bc = 3(12) - 4k = 0 -> k = 9.

Masterclass Solution & Distractor Trap Analysis

Determinant = (3)(12) - (4)(k) = 36 - 4k = 0 -> 4k = 36 -> k = 9....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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