When finding an expression with multiplication or an exercise that has only multiplication operationsinside a parenthesis and the wholes expression is raised to a certain exponent, we can take the exponent and apply it to each of the terms of the expression or exercise. We must not forget to keep the multiplication signs between the terms. Property formula: (aĆb)n=anĆbn This property also pertains to algebraic expressions.
(5Ć2)3= Notice that we have a power of a product of whole numbers. We can see that the exponent3 is applied to the entire expression enclosed within the parentheses, therefore, we can raise each of the terms while maintaining the multiplication sign between them. We will obtain: 5323=Ć 125Ć8=1000
If we have a multiplication exercise with an exponent, we can apply the exponent to each of the terms separately.
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We will notice that the exponent applies to the entire expression enclosed in parentheses and that between the 2 and the X there is, in fact, a multiplication operation.
We can raise each of the terms of the expression to the exponent and we will obtain:
23ā X3=
8ā X3=
We will multiply theX by its coefficient and we will get:
8X3
Now let's move on to a slightly more complicated exercise.
(22ā X3)2
We see that the exponent 2 is outside the parentheses, therefore, it applies to the entire expression. The terms of the expression are multiplied, therefore, it is the power of a multiplication.
Well, now we can apply the exponent to each of the terms separately and we will not forget to maintain the multiplication between them.
We obtain:
(22)2ā (x3)2
We have obtained what is called: Power of a power
To be able to continue solving the exercise we will remember the following property:
Power of power
If we have a power of a power we must perform a multiplication of exponents, that is, multiply powers.
In symbols:
(an)k=anā k
First we will multiply the exponent located outside the parentheses by the exponent of the base2 and then, we will do it by the exponent of the baseX.
We will get:
24ā X6
16ā X6
Now we will multiply theX by its coefficient and we will have:
16X6
Do you know what the answer is?
Question 1
Choose the expression that corresponds to the following:
which will demonstrate to us that no matter how many terms the exercise includes, as long as there is multiplication between them and as long as they are raised to a certain power located outside of the parentheses, in such a case we can apply the power to each of the terms separately and maintain the multiplication operation between them.
(22Xā X5ā X2ā 2ā 5)3
Recommendation:
Before applying the power located outside of the parentheses to each of the terms separately, carefully observe the exercise.
If you look closely and are thoroughly familiar with the properties of powers or laws of exponents, you will immediately see that, you can first act inside the parentheses using the property of multiplication of powers with the same base to simplify the expression.
Let's remember that, when we have a multiplication of powers with the same base, we can add the exponents and obtain a single base with a single exponent.
If there is no exponent it means that the exponent is one and it is important that we remember to add it.
Upon observing the exercise we will discover that there are some equal bases: 2 and X.
Since the operation between all the terms is multiplication we can add the relevant exponents and in this way we will arrive at:
(23ā X8ā 5)3=
Now, with an already abbreviated expression between the parentheses, it will be easier and faster for us to apply the power located outside of the parentheses to each of the terms.
We will do it and obtain:
(23)3ā (x8)3ā (5)3=
29ā X24ā 53=
We can continue solving and we will arrive at:
512ā X24ā 125=
64,000ā X24=
Let's multiply theX by its coefficient and it will give us:
64,000X24=
Exercises with the Power of a Multiplication
(2Ć5)3=
(1Ć2)3=
(3Ć3)3=
(2Ć2)2=
(7Ć4)2=
(32XĆX5ĆX3)3=
(52XĆX2ĆX2)2=
(82XĆX2ĆX25Ć3X)3=
(24Ć5X2ĆX37Ć3X)3=
(24Ć5X2ĆXĆ8ĆX2)3=
Check your understanding
Question 1
Choose the expression that corresponds to the following:
To solve a power of a multiplication we must raise each of the factors to the indicated power and maintain the multiplication sign between the terms.
How to solve multiplication of powers with different bases?
The law of exponents indicates that when we have multiplication of powers with the same base, we must add the exponents, however, if we have different bases we cannot apply this law.
How to multiply powers with different bases and the same exponent?
If the base is different we cannot add the exponents, although in some exercises it will be possible to manipulate the expressions to equalize the bases and apply the law of exponents.
How to solve addition of powers with different bases?
There is no law for the addition of powers. It does not matter if they have the same base or not.
How are powers multiplied with the same exponent and different bases?
If the base is different, we cannot directly apply the law of exponents. Sometimes we may manipulate the bases to try to equalize them and apply the law.
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That is, the power applied to a product inside parentheses, is applied to each of the terms within, when the parentheses are opened.
We then apply the above rule to the problem:
(2ā 8ā 7)2=22ā 82ā 72
Therefore, the correct answer is option d.
Note:
From the formula of the power property inside parentheses mentioned above, it might seem as though it refers to only two terms of the product inside of the parentheses, but in reality, it is also valid for the power over a multiplication of many terms inside parentheses, as was seen above.
A good exercise is to demonstrate that if the previous property is valid for a power over a product of two terms inside parentheses (as formulated above), then it is also valid for a power over several terms of the product inside parentheses (for example - three terms, etc.).
Answer
22ā 82ā 72
Exercise #2
(2Ć7Ć5)3=
Video Solution
Step-by-Step Solution
To solve the problem, we need to apply the power of a product exponent rule. This rule states that when you raise a product to a power, it's the same as raising each factor to that power. In mathematical terms, if you have (abc)n, it is equivalent to anĆbnĆcn.
Let's apply this rule step by step:
Our original expression is: (2Ć7Ć5)3.
We first identify the factors inside the parentheses as 2, 7, and 5.
According to the Power of a Product rule, we can distribute the exponent3 to each factor:
First, raise 2 to the power of 3 to get 23.
Then, raise 7 to the power of 3 to get 73.
Finally, raise 5 to the power of 3 to get 53.
Therefore, the expression (2Ć7Ć5)3 simplifies to 23Ć73Ć53.
Answer
23Ć73Ć53
Exercise #3
(9Ć2Ć5)3=
Video Solution
Step-by-Step Solution
We use the law of exponents for a power that is applied to parentheses in which terms are multiplied:
(xā y)n=xnā yn
We apply the rule to the problem:
(9ā 2ā 5)3=93ā 23ā 53
When we apply the power within parentheses to the product of the terms we do so separately and maintain the multiplication,
Therefore, the correct answer is option B.
Answer
93Ć23Ć53
Exercise #4
Choose the expression that corresponds to the following:
(2Ć11)5=
Video Solution
Step-by-Step Solution
To solve the expression, we can apply the rule for the power of a product, which states that(aĆb)n=anĆbn.
In this case, our expression is (2Ć11)5, wherea=2 and b=11, and n=5.
Applying the power of a product rule gives us:
an=25
bn=115
Therefore, (2Ć11)5=25Ć115.
Answer
25Ć115
Exercise #5
Choose the expression that corresponds to the following:
(10Ć3)4=
Video Solution
Step-by-Step Solution
To solve this problem, we'll apply the power of a product rule to the expression (10Ć3)4.
Step 1: Identify the expression. The given expression is (10Ć3)4.
Step 2: Apply the power of a product law. According to the rule, (aĆb)n=anĆbn, our expression becomes: (10Ć3)4=104Ć34.
Step 3: Evaluate the choices: - First choice: 34Ć104 Rearranging terms, this is equivalent to 104Ć34. Therefore, it matches our transformed expression. - Second choice: 304 Since 30=10Ć3, (10Ć3)4=304. This simplifies to the same expression. - Third choice: 104Ć34
Therefore, the solution is that all answers are correct.