The first video in this lesson will go over the following vocabulary words:

- Expression = A statement using numbers and/or variables and an operator.
- Equation = Expressions with an equal sign (=).
- Formula = An equation that gives us instructions or a rule.
- Function = An equation where every input has only one output.

Expression, Equation, Formula, Function

Video Source (04:18 mins) | Transcript

The following video will explain more about how a function works using the metaphor or parable of a seed. Just as a seed is only able to produce the one plant it is meant to create, a function can only produce one output for each input value.

Understanding Functions

Video Source (02:22 mins) | Transcript

This video references the following talk by Elder Uchtdorf: God's Harvest.

### Practice Problems

**1**. Choose the answer that will correctly complete the following sentence. Each unique input into a function can lead to ____. (

Solution

- only one output
- several outputs
- a random number of outputs

**2**. Choose the answer below that is an expression. (

Solution

- \(3x = 2\)
- \(5 + 1 = x\)
- \(3 − 1\)

**3**. Choose the answer below that is an equation. (

Solution

- \(3 + 4\)
- \(2x\)
- \(5 + 1 = x − 2\)

## Need More Help?

- Study other Math Lessons in the Resource Center.
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