In Self-Check 4 you simplifed algebraic fractions involving factorial notation by dividing the numerator and the denominator by the same factors. For example,
Or
In a similar fashion you can simplify expressions with factorials to solve equations.
Solving a Factorial Equation shows you how to simplify an expression that includes factorials in order to solve an equation.
If you want to review another example of how to solve an equation that involves factorial notation, read part c. from “Example 2” on pages 519 and 520 of the textbook. In this example you will see how three different methods can be used to solve the equation. The method you have not yet seen is solving by graphing. Which method do you prefer?
Self-Check 5
- Solve for n.
where n ∈ N. Answer
- Do “Your Turn” parts a. and c. on page 520 of the textbook. Answer
