You might also see a question on the ACT on adding or subtracting matrices.
Important note: you can only add or subtract two matrices of exactly the same dimensions.
When it comes to matrices on the test, you really just need to know the basics: Matrices can come in all sorts of sizes.
We write the size of a matrix first with its number of rows and then its number of columns. 3 rows and 2 columns: You might see a question on the ACT that asks you do what is called scalar multiplication.
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Then add the two products together for the determinant.
(3 × 12) (9 × 11) = 36 99 = 135 What is Matrix M × Matrix N?