Matrices

Question 1

When can two matrices be added?

Answer 1

Both have the same dimensions

Question 2

When can two matrices be subtracted?

Answer 2

Both have same dimensions

Question 3

When can two matrices be multiplied?

Answer 3

When AB, Amount of columns in A = Amount of Rows in B

Question 4

What is the formula for the determinant in 2x2 Matrix

Answer 4

ad - bc

Question 5

How to get the determinant for 3x3 matrix and beyond

Answer 5

+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.

Question 6

Formula for Inverse of 2x2 Matrix

Answer 6

1/the determinant * the matrix but b and c are negative.