Simplify (12×4)⁴ ÷ (4×12)¹¹: Complex Exponential Fraction Problem

Quotient Rule with Negative Exponents

Insert the corresponding expression:

(12×4)4(4×12)11= \frac{\left(12\times4\right)^4}{\left(4\times12\right)^{11}}=

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:13 First up, remember this!
00:16 In multiplication, it doesn't matter which number comes first.
00:22 We'll apply this idea and switch the order of the numbers.
00:26 Next, let's focus on dividing powers.
00:29 If A to the power of N is divided by A to the power of M...
00:35 ...it equals A to the power of M minus N.
00:40 We'll use this formula in our example.
00:43 Let's calculate the power together!
00:46 And that's how we find the solution! Great job.

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Insert the corresponding expression:

(12×4)4(4×12)11= \frac{\left(12\times4\right)^4}{\left(4\times12\right)^{11}}=

2

Step-by-step solution

To solve this problem, we will use the power of a quotient rule for exponents, which states: aman=amn\frac{a^m}{a^n} = a^{m-n}.

Here's a step-by-step solution:

  • Step 1: Identify the base and exponents in the problem.
  • Step 2: Apply the exponent rules.
  • Step 3: Simplify the expression by calculating the difference in exponents.

Now, let's apply these steps in detail:

Step 1: We have the expression (12×4)4(4×12)11 \frac{(12 \times 4)^4}{(4 \times 12)^{11}} . Here, the base is (12×4)(12 \times 4), and the exponents are 4 in the numerator and 11 in the denominator.

Step 2: Combine the terms using the commutative and associative properties of multiplication. Notice that the terms 12×412 \times 4 are identical in both the numerator and denominator. So, simplify using these instances: (12×4)4(12 \times 4)^4 in the numerator and (12×4)11(12 \times 4)^{11} in the denominator.

Step 3: Apply the power of a quotient rule:
(12×4)4(12×4)11=(12×4)411=(12×4)7 \frac{(12 \times 4)^4}{(12 \times 4)^{11}} = (12 \times 4)^{4-11} = (12 \times 4)^{-7}

This means the simplified expression is (12×4)7 (12 \times 4)^{-7} .

Therefore, the correct answer among the provided choices is (12×4)7 \left(12\times4\right)^{-7} , which corresponds to choice 1.

3

Final Answer

(12×4)7 \left(12\times4\right)^{-7}

Key Points to Remember

Essential concepts to master this topic
  • Rule: When dividing powers with same base: aman=amn \frac{a^m}{a^n} = a^{m-n}
  • Technique: Subtract exponents: (12×4)4÷(12×4)11=(12×4)411 (12 \times 4)^4 ÷ (12 \times 4)^{11} = (12 \times 4)^{4-11}
  • Check: Verify that 4 - 11 = -7, giving (12×4)7 (12 \times 4)^{-7}

Common Mistakes

Avoid these frequent errors
  • Adding instead of subtracting exponents in division
    Don't add exponents when dividing: 4 + 11 = 15! This gives you (12×4)15 (12 \times 4)^{15} instead of the correct answer. Division of powers requires subtracting exponents. Always remember: divide powers = subtract exponents.

Practice Quiz

Test your knowledge with interactive questions

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

FAQ

Everything you need to know about this question

Why does 12×4 12 \times 4 equal 4×12 4 \times 12 ?

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Because of the commutative property of multiplication! The order doesn't matter when multiplying numbers, so 12×4=4×12=48 12 \times 4 = 4 \times 12 = 48 . This means both expressions have the same base.

What does a negative exponent mean?

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A negative exponent means reciprocal! (12×4)7=1(12×4)7 (12 \times 4)^{-7} = \frac{1}{(12 \times 4)^7} . It's like flipping the fraction and making the exponent positive.

How do I remember when to subtract exponents?

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Use this trick: Division = Subtraction! When you see a fraction with powers of the same base, always subtract the bottom exponent from the top exponent.

Can I calculate 12×4 12 \times 4 first?

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You could calculate 12×4=48 12 \times 4 = 48 first, but it's not necessary! The question asks for the expression in terms of (12×4) (12 \times 4) , so keep it that way.

What if I got (12×4)7 (12 \times 4)^7 as my answer?

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You likely forgot the negative sign! Remember: 411=7 4 - 11 = -7 , not 7 7 . Always be careful with subtraction when the second number is larger.

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