# Exponent Rules

### What are Exponent Rules?

We already know how to add, subtract, and multiply. But, just as Dua Lipa has some New Rules, we have new ones of our own that we need to learn in order to simplify exponent expressions: product rules, quotient rules, and power rules..

Try out these rules in our product rule, quotient rule, and power rule calculators β¬οΈ.

### Simplifying Exponents Calculators

#### Product Rules Calculator

Simplify:

#### Step 1. Check Bases

First, weβre going to see if our bases (the blue numbers) match.

#### Step 2. Add Exponents

#### Step 2. Check Exponents

Next, weβre going to see if our exponents are the same.

If you think that we should be able to simplify more, let us know in the feedback!

In this lesson, weβll cover the three sets of exponent rules: Product Rules, Quotient Rules, and Power Rules. Here's a little preview of the rules we'll cover:

### Recap π§’ Exponent Rules Formulas

Product Rule | Quotient Rule | |

Same Exponent | $a_{x}Γb_{x}=(aΓb)_{x}$ | $b_{x}a_{x}β=(baβ)_{x}$ |

Same Base | $a_{x}Γa_{y}=a_{(x+y)}$ | $a_{y}a_{x}β=a_{(xβy)}$ |

Power Rule |

$(a_{x})_{y}=a_{(xΓy)}$ |

### Product Rules

Whenever we multiply numbers with exponents, we need to apply one of the Product Rules. The Product Rule we use depends on whether the bases or exponents of the numbers weβre multiplying match.

Product Rule | |

Same Exponent | $a_{x}Γb_{x}=(aΓb)_{x}$ |

Same Base | $a_{x}Γa_{y}=a_{(x+y)}$ |

See how in both rules, the blue highlights the parts that are the same? If nothing is the same, we can't simplify. Things that are totally different can't be easily combined.

But, if there are things in common between different parts of the equation, like the bases or the exponents are the same, then we CAN combine them.

Letβs walk through an example! Do the bases or the exponents match in this equation?

$4_{3}Γ5_{3}=?$Thatβs right! π In this equation, the bases are different (4 and 5), but the exponents are the same (3). This means we can follow this formula, which is the Product Rule for numbers with matching exponents:

$a_{x}Γb_{x}=(aΓb)_{x}$Right! Let's think about why we can do this. Let's multiply our original expression out:

$4_{3}Γ5_{3}=4Γ4Γ4βΓ5Γ5Γ5β$We have three 4's and three 5's. Since order doesn't matter when we multiply, we can move our numbers around a little:

$4_{3}Γ5_{3}=4Γ5βΓ4Γ5βΓ4Γ5β$Merging the part that's the same (the exponent) lets us rewrite this expression, so then we can actually take it a step further and multiply out the inside:

$4_{3}Γ5_{3}=(4Γ5)_{3}=20_{3}$Letβs take a look at a different example. Do the bases or the exponents match in this equation?

$6_{4}Γ6_{2}=?$Thatβs right! π In this equation, the bases match, so we can use the Product Rule for numbers with matching bases:

$a_{x}Γa_{y}=a_{(x+y)}$Using this formula, let's try simplifying this expression:

$6_{4}Γ6_{3}=?$Like we did before, input the right values to match our Product Rule formula above:

Great work using the product rule to simplify ! π₯³ Like we did last time, let's think about why this rule works. We can multiply out the original expression:

$6_{4}Γ6_{3}=6Γ6Γ6Γ6βΓ6Γ6Γ6β$We have four 6's for the first part and three 6's for the second, giving us a total of seven 6's. But wait! That means we can just write it as:

$6_{4}Γ6_{3}=6_{(4+3)}=6_{7}$#### Exponents: the younger siblings π©βπ¦

Think of the exponents as the little siblings of the base numbers (they are smaller π¬). When the base numbers do fancy multiplication or division, our exponents can only do the easier versions - addition and subtraction!

So, while we may be multiplying in $6_{4}Γ6_{3}$, when we combine the 6's, we can only add the exponents:

$6_{4}Γ6_{3}=6_{(4+3)}=6_{7}$So remember, if either the bases are the same or the exponents are the same, we can simplify two powers multiplied by each other using one of our Product Rules.

#### Simplify Your Bases

Sometimes, it may not seem like the bases of two exponential terms match β but, if you can simplify the bases at all, there may be a match hiding in plain sight!

Now that we've gotten to know the Product Rules, let's move on to Quotient Rules.

### Quotient Rules

Quotient Rules work pretty much the same way that the Product Rules do! Just swap out division for multiplication with the bases, and subtraction for addition with the exponents, like this:

Quotient Rule | |

Same Exponent | $b_{x}a_{x}β=(baβ)_{x}$ |

Same Base | $a_{y}a_{x}β=a_{(xβy)}$ |

Letβs practice this! Do the bases or exponents match?

$10_{2}10_{3}β=?$Thatβs right! π In this equation, the bases match, so we can use the Quotient Rule for numbers with matching bases:

$a_{y}a_{x}β=a_{(xβy)}$Using this formula, let's try simplifying this expression:

You nailed it! π Let's think about why this works. We can multiply out our original expression first:

$10_{2}10_{3}β=10Γ1010Γ10Γ10β$Now, since everything is being multiplied on the top and bottom, we can actually cancel out two of the 10's:

$10_{2}10_{3}β=10Γ1010Γ10Γ10β$Then, we're left with just one 10, which is exactly how our rule worked:

$10_{2}10_{3}β=10_{3β2}=10_{1}=10$Letβs try another example. Do the bases or exponents match in this equation?

$4_{3}8_{3}β=?$Exactly right! π In this equation, the exponents match, so we can use the Quotient Rule for numbers with matching exponents:

$b_{x}a_{x}β=(baβ)_{x}$Using this formula, let's try simplifying this expression:

Amazing job!! π€© Let's think about why this one works also. We can multiply out the top and bottom of our original:

$4_{3}8_{3}β=4Γ4Γ48Γ8Γ8β$Great job! Letβs keep moving: next stop, Power Rules.

### Power Rules

The first Power Rule states that when you raise one term with an exponent to another power, you multiply the two exponents. Itβs described by this formula:

$(a_{x})_{y}=a_{(xΓy)}$Letβs simplify this expression using our formula:

You nailed it! π Now, for our last step, what does this simplify to?

Nice job! π Thereβs one more Power Rule to learn to explain what you should do if the exponent is raised to a power:

$a_{(x_{y})}$In that case, you apply the exponents one by one, like this:

$2_{(2_{3})}=2_{8}=256$Letβs test our knowledge of these two Power Rules. Match the following terms to the Power Rule that applies to them:

Great work! Congratulations on learning about the three sets of Exponent Rules. π Celebrate with a gif!