Matrices Flashcards
1
Q
When can two matrices be added?
A
Both have the same dimensions
2
Q
When can two matrices be subtracted?
A
Both have same dimensions
3
Q
When can two matrices be multiplied?
A
When AB, Amount of columns in A = Amount of Rows in B
4
Q
What is the formula for the determinant in 2x2 Matrix
A
ad - bc
5
Q
How to get the determinant for 3x3 matrix and beyond
A
+a * determinant of matrix not in a’s row or column - b * determinant of matrix not in b’s row or column * + c * determinant of matrix not in c’s row or column - d * determinant of matrix not in d’s row of column etc.
6
Q
Formula for Inverse of 2x2 Matrix
A
1/the determinant * the matrix but b and c are negative.
