Is the matrix [[1, 2], [2, 4]] invertible?
Is the matrix [[1, 2], [2, 4]] invertible?
Approach: Check if the determinant is zero.
No. Determinant is (1*4) - (2*2) = 0.
Follow-up: What is the rank of this matrix?
Key concepts: invertibility.
Is the matrix [[1, 2], [2, 4]] invertible?
Approach: Check if the determinant is zero.
No. Determinant is (1*4) - (2*2) = 0.
Follow-up: What is the rank of this matrix?
Key concepts: invertibility.