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Math 104: Calculus14 chapters | 115 lessons | 11 flashcard sets

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Lesson Transcript

Instructor:
*Robert Egan*

How do we keep track of a rapidly multiplying population of bunnies? Well, those are simply powers of 2. Review powers and simplify problems with exponents in this lesson.

Have you ever heard of that bunny problem? You know, the one where you start out with one bunny, and then all of a sudden you have two bunnies, and each of those bunnies has a bunny, so you end up with four bunnies? Each of those bunnies has a bunny, and you have eight bunnies and then 16 and 32 and 64 - your population just keeps growing!

You could've said that your population started out with one times two bunnies times two bunnies times two bunnies and so on and so forth. If we ignore that one, because it doesn't really matter in this case, you end up with a case of repeated multiplication: 2 * 2 * 2 * 2 * 2 ... When *x*=2, we can write this as *x* * *x* * *x* * *x* * *x* ... and so on and so forth, which gives us ** x^n**. Now, in

Now these powers are used all over in math and really all over the world. For example, if we want to look at mummies and know how old they are, we use an approach like carbon dating. And, carbon dating is used with powers, which might be something like 2.7^-*t*, where *t* is time. So we're using a power to determine the age of a mummy. Another example is the metric system. In the metric system, we're using powers that look like 10^*x* meters. Now, if *x*=-10, you're looking at something about the size of an atom. If *x*=20, you're looking at something roughly the size of the galaxy.

One type of power that we look at and care about a lot is **polynomials**. So we care about *x* to the *n*th power, where *n* is some number, and we care about these because they are things like *x* or *x*^2, which is *x* * *x*, or *x*^3, which is *x* * *x* * *x*. In general, we care about *x*^*n*. Now let's look at some properties of *x*^*n*. We know that ** x^1=x**, but what about

So what are the properties?

There are no **addition** properties; there's nothing special for addition. For example 2^3 + 2^2 does NOT equal 2^5. You can see this because 2^3 = 8 and 2^2 = 4 while 2^5 = 32, and 8 + 4 = 12, not 32.

Now, for **multiplication**, we do have some properties, like *x*^3 * *x*^2. Well, *x*^3 = *x* * *x* * *x* and *x*^2 = *x* * *x*. So we know that when we multiply those together, it will equal *x* * *x* * *x* * *x* * *x*, which is *x*^5. So for multiplication, (*x*^3)(*x*^2) = *x*^5. You can generalize that to (*x*^*n*)(*x*^*m*)=*x*^(*n* + *m*). Going back to the case of 2, we have 2^3 * 2^2 = 8 * 4 = 32 = 2^5.

What about **division**? Well, if I have 1 / (*x*^2), I can write that as *x*^-2. This one's a little but funky, but it's a useful notation. You can use it in combination with multiplication to find things like (2^3) / (2^2). If you solve this out, you have 8 / 4. We can also think of it as (2^3)(2^-2), because 1 / (2^2) is 2^-2. Then, I can use my multiplication property and say this is equal to 2^(3 - 2), where I've added my exponents of 3 and -2. So, 2^(3 - 2) = 2^1 = 8 / 4 = 2.

Our last property is that of a **power**. Say we have (2^2)^3. This is that same as saying (2 * 2)(2 * 2)(2 * 2), which is 2^6. It's reasonable to think that (2^2)^3 is the same as saying 2^(2 * 3), which is equal to 2^6. Again, you can generalize that by saying (*x*^*n*)^*m* = *x*^(*n***m*).

We looked at repeated multiplications, or our bunny problem, and we can write those as ** x^n**, where

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Math 104: Calculus14 chapters | 115 lessons | 11 flashcard sets

- What is a Function: Basics and Key Terms 7:57
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