### All ACT Math Resources

## Example Questions

### Example Question #1 : Matrices

Evaluate:

**Possible Answers:**

**Correct answer:**

This problem involves a scalar multiplication with a matrix. Simply distribute the negative three and multiply this value with every number in the 2 by 3 matrix. The rows and columns will not change.

### Example Question #2 : Matrices

What is ?

**Possible Answers:**

**Correct answer:**

You can begin by treating this equation just like it was:

That is, you can divide both sides by :

Now, for scalar multiplication of matrices, you merely need to multiply the scalar by each component:

Then, simplify:

Therefore,

### Example Question #3 : Matrices

If , what is ?

**Possible Answers:**

**Correct answer:**

Begin by distributing the fraction through the matrix on the left side of the equation. This will simplify the contents, given that they are factors of :

Now, this means that your equation looks like:

This simply means:

and

or

Therefore,

### Example Question #4 : Matrices

Simplify:

**Possible Answers:**

**Correct answer:**

Scalar multiplication and addition of matrices are both very easy. Just like regular scalar values, you do multiplication first:

The addition of matrices is very easy. You merely need to add them directly together, correlating the spaces directly.

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