Simplify Powers of 2: Solving 2³ × 2⁴ ÷ 2⁵

Exponent Rules with Multiplication and Division

Solve the following exercise:

232425= \frac{2^3\cdot2^4}{2^5}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Simplify the following expression
00:04 When multiplying powers with equal bases
00:07 The power of the result equals the sum of the powers
00:11 We'll use this formula in our exercise, and add the powers
00:20 When dividing powers with equal bases
00:23 The power of the result equals the difference of the powers
00:28 We'll use this formula in our exercise, and subtract the powers
00:35 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Solve the following exercise:

232425= \frac{2^3\cdot2^4}{2^5}=

2

Step-by-step solution

In order to simplify the given expression, we will use the following two laws of exponents:

a. Law of exponents for multiplication of terms with identical bases:

aman=am+n a^m\cdot a^n=a^{m+n}

b. Law of exponents for division of terms with identical bases:

aman=amn \frac{a^m}{a^n}=a^{m-n}

Let's solve the given expression:

232425= \frac{2^3\cdot2^4}{2^5}= First, since in the numerator we have multiplication of terms with identical bases, we'll use the law of exponents mentioned in a:

232425=23+425=2725= \frac{2^3\cdot2^4}{2^5}= \\ \frac{2^{3+4}}{2^5}=\\ \frac{2^{7}}{2^5}=\\ We'll continue, since we have division of terms with identical bases, we'll use the law of exponents mentioned in b:

2725=275=22=4 \frac{2^{7}}{2^5}=\\ 2^{7-5}=\\ 2^2=\\ \boxed{4}

Let's summarize the simplification of the given expression:

232425=2725=22=4 \frac{2^3\cdot2^4}{2^5}= \\ \frac{2^{7}}{2^5}=\\ 2^2=\\ \boxed{4}

Therefore, the correct answer is answer d.

3

Final Answer

4 4

Key Points to Remember

Essential concepts to master this topic
  • Multiplication Rule: When multiplying same bases, add exponents: aman=am+n a^m \cdot a^n = a^{m+n}
  • Division Rule: When dividing same bases, subtract exponents: aman=amn \frac{a^m}{a^n} = a^{m-n}
  • Verification: Check by calculating: 22=4 2^2 = 4 matches our final answer ✓

Common Mistakes

Avoid these frequent errors
  • Adding exponents when dividing
    Don't add exponents in division like 2725=27+5=212 \frac{2^7}{2^5} = 2^{7+5} = 2^{12} = 4096! This confuses multiplication and division rules. Always subtract exponents when dividing: 2725=275=22=4 \frac{2^7}{2^5} = 2^{7-5} = 2^2 = 4 .

Practice Quiz

Test your knowledge with interactive questions

\( 112^0=\text{?} \)

FAQ

Everything you need to know about this question

Why do I add exponents when multiplying but subtract when dividing?

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Think of exponents as counting repeated multiplication. When you multiply 2324 2^3 \cdot 2^4 , you're combining all the 2's together, so you add the counts. When dividing, you're canceling out matching factors, so you subtract!

Can I work from left to right instead?

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Yes! You could solve 232425 \frac{2^3 \cdot 2^4}{2^5} as 232425 2^3 \cdot 2^4 \cdot 2^{-5} and get the same answer. The key is applying the exponent rules correctly.

What if the bases were different numbers?

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These exponent rules only work with identical bases. If you had 2334 2^3 \cdot 3^4 , you cannot combine them using these rules - you'd need to calculate each term separately first.

How do I remember which operation uses which rule?

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Use this memory trick: Multiplication = More (add exponents), Division = Decrease (subtract exponents). The operations match what happens to the exponent values!

Is there a way to check my work?

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Absolutely! Calculate the original expression step by step: 23=8 2^3 = 8 , 24=16 2^4 = 16 , 25=32 2^5 = 32 . So 8×1632=12832=4 \frac{8 \times 16}{32} = \frac{128}{32} = 4

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