# Matrices - Scalar Multiplication | Don't Memorise | Summary and Q&A

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March 30, 2016
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Infinity Learn NEET
Matrices - Scalar Multiplication | Don't Memorise

## TL;DR

Matrix multiplication with a constant is possible and each element of the matrix is multiplied by the constant to get the resulting matrix. It is also possible to find the negative of a matrix using scalar multiplication.

## Key Insights

• ✖️ Matrix multiplication with a constant involves multiplying each element of the matrix by the constant to obtain the resulting matrix.
• 🪈 The resulting matrix will have the same order as the original matrix.
• ✖️ Scalar multiplication allows finding the negative of a matrix by multiplying each element with -1.
• ✖️ Scalar multiplication is a case of matrix multiplication with a constant.
• ✖️ Scalar multiplication follows the commutative property.
• ✖️ The concept of scalar multiplication is important in linear algebra.
• ⚖️ Scalar multiplication can be used to scale or resize matrices.

## Transcript

can a matrix be multiplied with a number can this Matrix be multiplied with say three is this mathematically possible yes it is possible to get the resulting Matrix each element of the Matrix is Multiplied with this number let's see what the resulting Matrix looks like the order of the resulting Matrix will be the same as the order of the original ... Read More

### Q: Can a matrix be multiplied by a number?

Yes, a matrix can be multiplied by a number using scalar multiplication. Each element of the matrix is multiplied by the number to obtain the resulting matrix.

### Q: What is the order of the resulting matrix when multiplying a matrix with a constant?

The order of the resulting matrix will be the same as the original matrix.

### Q: How do you find the negative of a given matrix?

To find the negative of a matrix, multiply each element of the matrix by -1 using scalar multiplication. This is equivalent to multiplying the matrix by -1.

### Q: What is scalar multiplication?

Scalar multiplication refers to multiplying a matrix by a constant. Each element of the matrix is multiplied by the constant to obtain the resulting matrix.

## Summary & Key Takeaways

• Matrix multiplication with a constant is mathematically possible, where each element of the matrix is multiplied by the constant to obtain the resulting matrix.

• The order of the resulting matrix will be the same as the original matrix.

• Scalar multiplication allows finding the negative of a matrix by multiplying each element with -1.