Examples with solutions for Multiplication of Powers: Variable in the exponent of the power

Exercise #1

Reduce the following equation

6x×6a×6b= 6^x\times6^a\times6^b=

Video Solution

Step-by-Step Solution

To solve this problem, we'll simplify the given equation using the rules of exponents:

  • Identify that all terms in the product 6x×6a×6b6^x \times 6^a \times 6^b have the same base, which is 6.
  • Apply the exponent multiplication rule: When multiplying powers with the same base, we add the exponents together. Therefore, the expression becomes 6x+a+b6^{x+a+b}.

By applying this exponent rule, we determine that the simplified expression is 6x+a+b6^{x+a+b}.

Therefore, the solution to the problem is 6x+a+b 6^{x+a+b} .

Answer

6x+a+b 6^{x+a+b}

Exercise #2

Reduce the following equation:

83x×83y×82y+x= 8^{3x}\times8^{3y}\times8^{2y+x}=

Video Solution

Step-by-Step Solution

To solve this problem, let's simplify the expression 83x×83y×82y+x 8^{3x} \times 8^{3y} \times 8^{2y+x} using exponent rules:

Step 1: Identify the exponents in each term:
- The first term is 83x8^{3x} with an exponent of 3x3x.
- The second term is 83y8^{3y} with an exponent of 3y3y.
- The third term is 82y+x8^{2y+x} with an exponent of 2y+x2y+x.

Step 2: Apply the multiplication of powers rule:
Since all terms have the same base of 8, add the exponents: (3x)+(3y)+(2y+x)(3x) + (3y) + (2y + x).

Step 3: Simplify the expression:
Adding the terms in the exponent gives us: 3x+3y+2y+x=4x+5y3x + 3y + 2y + x = 4x + 5y.

Therefore, the simplified expression is 84x+5y 8^{4x+5y} .

Answer

84x+5y 8^{4x+5y}

Exercise #3

Reduce the following equation:

6a×64a= 6^a\times6^{4a}=

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Identify the given expression and its components.

  • Recognize that both terms share the same base.

  • Apply the rule for multiplying powers with the same base, bm×bn=bm+nb^m \times b^n = b^{m+n}.

  • Calculate the exponent by adding the powers together.

Let's work through these steps:

Given the expression:
6a×64a 6^a \times 6^{4a}

Since both terms share the same base (6), we use the rule for multiplying powers with the same base:

6a×64a=6a+4a 6^a \times 6^{4a} = 6^{a + 4a} .

Simplify the exponent:

a+4a=5a a + 4a = 5a .

Thus, the expression simplifies to:

65a 6^{5a} .

Since the correct placement of our steps has directly given us choice C and corroborated choice B as intermediary work, B+C represents the comprehensive workings of the problem; thus, B+C are correct is the most comprehensive solution.

Answer

B+C are correct

Exercise #4

Reduce the following equation:

7x+a×7a×7x= 7^{x+a}\times7^a\times7^x=

Video Solution

Step-by-Step Solution

To solve this problem, we'll start by applying the rules for multiplying powers with the same base.

  • Step 1: Identify the expression given as 7x+a×7a×7x7^{x+a} \times 7^a \times 7^x.
  • Step 2: Apply the rule am×an=am+na^m \times a^n = a^{m+n} to combine the exponents since all terms have the same base, 7.

Let's proceed to simplify:

Combine the exponents:

7x+a×7a×7x=7(x+a)+a+x7^{x+a} \times 7^a \times 7^x = 7^{(x+a) + a + x}.

Now, simplify the addition of the exponents:

7(x+a)+a+x=7x+a+a+x7^{(x+a) + a + x} = 7^{x + a + a + x}.

Combine like terms in the exponent:

x+a+a+x=2x+2ax + a + a + x = 2x + 2a.

Thus, the expression simplifies to:

72x+2a7^{2x+2a}.

Therefore, the simplification of the given expression is 72x+2a7^{2x+2a}.

Answer

72x+2a 7^{2x+2a}

Exercise #5

Reduce the following equation :

92a×92x×9a= 9^{2a}\times9^{2x}\times9^a=

Video Solution

Step-by-Step Solution

To solve this problem, we'll follow these steps:

  • Step 1: Recognize that all the terms have the same base, which is 9.
  • Step 2: Apply the exponent addition rule to combine the exponents.
  • Step 3: Simplify the result by performing algebraic addition on the exponents.

Now, let's work through each step:
Step 1: The problem gives us the expression 92a×92x×9a 9^{2a} \times 9^{2x} \times 9^a . All terms share the same base, which is 9.
Step 2: Using the property of exponents bm×bn=bm+n b^m \times b^n = b^{m+n} , add the exponents: (2a)+(2x)+a (2a) + (2x) + a .
Step 3: Combine like terms: 2a+a+2x=3a+2x 2a + a + 2x = 3a + 2x . So, the expression becomes 93a+2x 9^{3a+2x} .

Therefore, the simplified form of the given equation is 93a+2x 9^{3a+2x} .

Answer

93a+2x 9^{3a+2x}

Exercise #6

Reduce the following equation:

a3×a5×a4= a^{-3}\times a^5\times a^{-4}=

Video Solution

Step-by-Step Solution

The given expression is a3×a5×a4 a^{-3} \times a^5 \times a^{-4} .

To simplify, use the product of powers property, which states that when multiplying like bases, you add the exponents:

  • Apply the rule: a3×a5×a4=a3+54 a^{-3} \times a^5 \times a^{-4} = a^{-3+5-4} .
  • Calculate the sum of the exponents: 3+54=2-3 + 5 - 4 = -2.

This simplifies the expression to a2 a^{-2} .

Note that a2 a^{-2} can also be expressed as 1a2\frac{1}{a^2} using the property of negative exponents (an=1an)(a^{-n} = \frac{1}{a^n}).

Now, let's evaluate the choices:

  • Choice 1: a2 a^{-2} , which matches our simplification.
  • Choice 2: 1a2\frac{1}{a^2}, which is another form of a2 a^{-2} .
  • Choice 3: a3+54 a^{-3+5-4} , which correctly reflects the intermediate step we computed.
  • Choice 4 states "All answers are correct," which, considering all interpretations and simplifications are valid, is indeed true.

Therefore, the correct answer is: All answers are correct, as each choice corresponds to a logical step or equivalent expression in reducing the equation.

Answer

All answers are correct

Exercise #7

Reduce the following equation:

83x×83y×82y+x= 8^{-3x}\times8^{-3y}\times8^{2y+x}=

Video Solution

Step-by-Step Solution

To solve this problem, we need to simplify the expression 83x×83y×82y+x 8^{-3x} \times 8^{-3y} \times 8^{2y+x} using exponent rules. Let's break it down step-by-step.

First, recognize that each term in the product has the same base, which is 8. The multiplication rule for exponents allows us to add the exponents when multiplying like bases. Our expression is:

83x×83y×82y+x 8^{-3x} \times 8^{-3y} \times 8^{2y+x}

According to the rule am×an=am+n a^m \times a^n = a^{m+n} , we add the exponents of each term:

(3x)+(3y)+(2y+x)(-3x) + (-3y) + (2y + x)

Combine the exponents inside the parentheses:

3x3y+2y+x-3x - 3y + 2y + x

Now, group and simplify like terms:

  • The terms with x x : 3x+x=2x-3x + x = -2x
  • The terms with y y : 3y+2y=y-3y + 2y = -y

Combine these results:

The expression becomes 2xy -2x - y .

Therefore, the reduced form of the original expression is:

82xy 8^{-2x-y}

Answer

82xy 8^{-2x-y}