3.9: Exponents
- Page ID
- 129529
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After completing this section, you should be able to:
- Apply the rules of exponents to simplifying expressions.
Sometimes, we look for shorthand when writing or expressing something that simply takes too long. The use of LOL and tl;dr. This shorthand only works if everyone reading the shorthand knows what it stands for. Using exponents is a similar instance. Writing out a long string of a number times itself over and over takes too much time, and eventually one would forget how many of the value has been written or read. For example, . There has to be a shorter and more efficient way to write 8 times itself 1, 2, 3….hmmmm, 19 times.
And that’s the role that exponents play in mathematics. They are shorthand for multiplying a number by itself a number of times. Without it, calculations would become a mess and we’d have to write a lot more.
Applying the Rules of Exponents to Simplify Expressions
Squaring a number is multiplying it by itself, and has that name because it is the area of a square with that side length. Cubing a number is finding the volume of a cube with that length of sides. That’s why we refer to as five squared, or as ten cubed. Exponents represent that multiplication.
Let’s remind ourselves of the terminology associated with exponents and what exponents represent. Suppose you want to multiply a number, let’s label that number , by itself some number of times. Let’s label the number of times . We denote that as . We say raised to the th power. When we write or see , we call the 7 the base and we call 5 the exponent. What it represents is 7 multiplied by itself 5 times. This means exponents are used as a shorthand for repeated multiplications, where we write . We would write and say seven to the fifth power.
Video
The definitions of base and exponent make it possible to understand the exponent rules.
Product Rule for Exponents
The first rule we examine is the product rule, . This rule means that when we multiply a base raised to a power times the same base to another power, the result is the base raised to the sum of the powers. To demonstrate, consider . If we apply the product rule to that we get . This can be tested by looking at the multiplications that are represented. The is 9 times itself 3 times, while is 9 times itself 5 times. Substituting those into we see , which is what the formula told us would happen.
Checkpoint
Caution: The product rule only applies when the bases are the same. If the bases are different, we do not apply this rule.
FORMULA
If a number, , raised to a power, , is then multiplied by raised to another power, , the result is .
Example 3.107
Using the Product Rule for Exponents
If possible, use the product rule to simplify the following:
- Answer
- We can apply the product rule to simplify the expression because the bases are the same and we are multiplying.
- Since the bases are not the same (one is 5, the other 8), this cannot be simplified using the product rule for exponents.
Your Turn 3.107
These rules can be applied to unknowns too.
Example 3.108
Using the Product Rule for Exponents of Unknowns
Use the product rule to simplify .
- Answer
The bases are the same, and we are multiplying, so we apply the multiplication rule to simplify the expression.
Your Turn 3.108
Quotient Rule for Exponents
The next rule we examine is the quotient, or division, rule.
FORMULA
When a number, , raised to a power, , is divided by raised to another power, , then the result is .
This rule means that when we divide a base raised to a power by the same base to another power, the result is the base raised to the difference of the powers. To demonstrate, consider . If we apply the quotient rule to that, we get . This can be tested by looking at the division that is represented. Remember, is 14 multiplied to itself 13 times, while is 14 multiplied to itself 6 times. Substituting those into gives the following:
We see here that there are a LOT of fours to be divided out.
What remains is 4 to the 7th power, .
All of the work above confirmed what the formula told us would be the result.
Checkpoint
Caution: The quotient rule only applies when the bases are the same. If the bases are different, we do not apply this rule.
Example 3.109
Using the Quotient Rule for Exponents
Use the quotient rule to simplify .
- Answer
We can apply the quotient rule to simplify the expression since the bases are the same and we are dividing.
Your Turn 3.109
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A natural consequence of the quotient rule is what it means to raise a non-zero number to the zeroth power. Let’s look at the simplification when the exponents are equal.
We know that a number divided by itself is 1, so . From that is must be that . This provides the rule for a number raised to the power 0: .
FORMULA
If you have a non-zero number , then .
Distributive Rule for Exponents
The next rule we look to is a distributive rule for exponents.
FORMULA
If you have a product, , and raise it to an exponent, , then .
This means that when we have two numbers multiplied together, and that is raised to a power, it is the same as raising each of the numbers to the same power first, then multiplying. For example, . This can be explained using the definition of exponents and multiplying all the factors.
We may change the order in which numbers are multiplied. This is the commutative property of the real numbers. This can be written as . Using exponents, that shortens to .
This also works in the other direction, . Read this way, if we have one base raised to an exponent, and another base raised to the same exponent, we can multiply the bases and raise that product to the shared exponent. For instance, .
Checkpoint
Caution: The exponent distributive rule, , only works if the exponents are the same.
Example 3.110
Using the Distributive Rule for Exponents
Use the exponent distributive rule to expand .
- Answer
Applying the distributive rule to the product, we get .
Your Turn 3.110
Example 3.111
Using the Distributive Rule for Exponents
Use the exponent distributive rule to expand .
- Answer
Applying the distributive rule to the product, we get .
Your Turn 3.111
This distribution also works for quotients. A fraction raised to an exponent equals the numerator raised to the exponent divided by the denominator raised to the exponent. For example, . Demonstrating this is similar to the previous rule.
FORMULA
When you have a fraction, , raised to an exponent, , then .
Example 3.112
Using the Distributive Rule for Exponents with Fractions
Use the exponent distributive rule to expand the following:
- Answer
- Applying the distributive rule to the quotient, we get .
- Applying the distributive rule to the quotient, we get .
Your Turn 3.112
Video
Power Rule
In the previous two sets of rules, we’ve seen exponents applied to products and quotients. Now we look to exponents applied to other exponents. For example, . This can be explained by examining what the outer exponent does. We raise to the fourth power, so we multiply by itself 4 times, . Now if we apply the product rule for exponents, this becomes .
FORMULA
If you raise a non-zero base, say , to an exponent , and raise that to another exponent, , you get the base raised to the product of the exponents, which is .
Example 3.113
Raising an Exponent to an Exponent
Expand the following:
- Answer
- Using the power rule of exponents, .
- Using the power rule of exponents, .
Your Turn 3.113
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Negative Exponent Rule
Up until now, we’ve only looked at positive exponents. The last exponent rule we look at is what negative exponents represent. Recall the quotient rule: . What would happen if the exponent in the denominator was larger than that in the numerator? For example, . If we apply the quotient rule, we obtain . We need to make sense of that negative exponent. To do so, we can expand the quotient and see what happens: . When we divide out common factors, only two factors of 4 are left in the denominator, as we see here:. Using exponent notation, this is . Since and represent the same number, , they are equal. This demonstrates how negative exponents are defined.
FORMULA
provided that .
Similarly, .
Example 3.114
Eliminating Negative Exponents
Convert the following to expressions with no negative exponent:
- Answer
- Using the negative exponent rule on the and multiplying, .
- Using the negative exponent rule on the and multiplying, .
- Begin by rewriting the expression as . Apply the negative exponent rule to in the expression, which becomes , which has no negative exponents.
Your Turn 3.114
Example 3.115
Eliminating Denominators by Using Negative Exponents
Use negative exponents to rewrite the following expressions with no denominator:
- Answer
- Rewrite the expression as . Then use the definition of negative exponents to rewrite the as . Last, multiply, yielding .
- Rewrite the expression as . Then use the definition of negative exponents to rewrite the as . Last, multiply, yielding .
Your Turn 3.115
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The table below shows a summary of the exponent rules from this section.
Rule | Example | In Words |
---|---|---|
Product Rule | A base raised to a power, times the same based raised to another power, is the base raised to the sum of the powers. | |
Quotient Rule | A base raised to a power, divided by the same based raised to another power, is the base raised to the difference of the powers. | |
Zero Power Rule provided that |
Any non-zero number raised to the zeroth power equals 1. | |
Distributive Rule, Multiplication | Exponents distribute across multiplication. | |
Distributive Rule, Division | Exponents distribute across division. | |
Power Rule | A base raised to a power, raised to another power, is the base raised to the first power times the second power. | |
Negative Exponent Rule provided that |
A base raised to a negative exponent is 1 divided by the base raised to the positive power, and vice versa. |
These rules often occur in tandem with each other, but it requires that you carefully apply the rules.
Example 3.116
Simplifying Expressions Using Exponent Rules
Simplify the following:
- Answer
- Step 1: To simplify this, we start by distributing the power 5 across the quotient:
Step 2: We distribute the power 5 in the numerator across that multiplication:
Step 3: We apply the power rule where indicated:
- Step 1: To simplify this, we start by distributing the power 6 across the quotient:
Step 2: We distribute the power 5 in the numerator across that multiplication:
Step 3: We apply the power rule where indicated:
- Step 1: To simplify this, we start by distributing the power 5 across the quotient:
Your Turn 3.116
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Video
Check Your Understanding
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Section 3.8 Exercises
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