ACTAdvanced (700+)Frequency: 1 - 2 questions
ACT Math Matrices & 2x2 Determinants
The ACT tests matrix addition/subtraction, scalar multiplication, and 2x2 determinants. The determinant of [[a, b], [c, d]] is calculated as ad - bc.
Core Formula & Concept Cheat Sheet
1Determinant: det([[a, b], [c, d]]) = ad - bc
2Matrix addition: Add corresponding elements
3Multiplication dimensions: (m x k) * (k x n) = (m x n)
The 700+ Score Trap
Computing ad + bc instead of ad - bc.
Test Your Mastery
Official Exam FormatLive Interactive Practice Drill
What is the determinant of the 2x2 matrix [[4, -2], [3, 5]]?
Frequently Asked Questions
Are determinants tested on the SAT?
No, matrices and determinants are exclusive to the ACT Math section.