Question

Which of the following statements are true about scalar multiplication of matrices?

You can multiply a matrix of any size by a scalar.
For any matrix A, 1 × A = A.
For any scalar r, rI = I, where I is the identity matrix.
You can scale geometric figures using scalar multiplication.
Scalar multiplication is a shortcut for repeated addition of the same matrix.
Scalar multiplication is not possible for matrices that are not square.

Answer 1

You can multiply a matrix of any size by a scalar.

For any matrix A, 1 × A = A.

You can scale geometric figures using scalar multiplication.

Scalar multiplication is a shortcut for repeated addition of the same matrix.

Answer 2

Answer: correct options are 1, 2, 4 and 5.